Recipe 24 / 24
GB · Contemporary British technique
Ultra-Crispy Smashed Potatoes
Floury potato is alkaline-parboiled, steam-dried, deliberately roughed, gently smashed, and roasted on a preheated metal tray. Cold lemon-chive sour cream supplies contrast without softening the brittle crust.
Build a brittle, craggy golden shell around a genuinely fluffy centre without needing a deep fryer.
- Place & style
- Contemporary British technique British · Small plate
- Yield
- 4 servings Vegetarian · spice 0/5
- Time
- 1 hr 35 min 20 min prep · 1 hr 15 min cook
- Cook level
- Intermediate fine-dining technique · vegetarian · gluten-free · oven · share plate
Bumbu / flavour foundation
garlic-rosemary infused oil, lemon, chive, cultured sour cream
A mild alkaline blanch loosens exterior cells. Steam-drying removes water; roughing creates a starchy coating; a controlled smash increases edges; and a hot tray sets the coating before the potato moves. Strained aromatics return after roasting so they perfume without burning.
Equipment
- large saucepan
- colander or wire rack
- small saucepan
- fine-mesh strainer
- heavy rimmed metal oven tray
- thin metal spatula
- flat-bottom tumbler or potato masher
- digital scale
Read the visual cue before each step. The clock is guidance; the food decides when you move.
01 · Market sheet
Know what you are buying.
Every ingredient is shown in context, named in English and Bahasa Indonesia, and tied to its job in the dish.Fresh produceSayur & bahan segar
1.2 kg, peeled and cut into 10-12 irregular 5-6 cm chunks
floury potatoes such as Sebago or Russet
kentang bertepung tinggi seperti Sebago, Russet, kentang tes, atau Atlantic
high dry matter creates a fluffy centre and enough surface starch for a brittle crust
Generated reference - not verified cook evidence.
Watch: Avoid green, heavily sprouted, bitter, waxy red, or very small new potatoes.
15 g, about 3 cloves, thinly sliced
garlic
bawang putih
infuses the oil without burning during the long roast
Generated reference - not verified cook evidence.
1, yielding 2 g zest and 15 ml juice
small lemon
lemon kecil
zest perfumes the sauce and juice cuts richness
Generated reference - not verified cook evidence.
Dry pantryBahan kering
2.5 L
water
air
measured alkaline cooking medium
Generated reference - not verified cook evidence.
22 g: 20 g for water and 2 g for sauce
fine salt, divided
garam halus, dibagi
seasons the potato internally and balances the cultured cream
Generated reference - not verified cook evidence.
2 g, about 1/2 level tsp
baking soda or sodium bicarbonate
soda kue atau natrium bikarbonat
raises pH just enough to soften the exterior into a crispable coating
Generated reference - not verified cook evidence.
Watch: Do not substitute baking powder or increase the amount; excess tastes alkaline and collapses potato.
80 ml
neutral high-heat oil
minyak netral tahan panas
infuses the crust and conducts dry oven heat
Generated reference - not verified cook evidence.
GarnishPelengkap
6 g, about 3 sprigs, finely chopped
fresh rosemary leaves
daun rosemary segar
piney aromatic contrast to potato and cultured cream
Generated reference - not verified cook evidence.
15 g, finely sliced
fresh chives
kucai segar
fresh allium finish without raw onion heaviness
Generated reference - not verified cook evidence.
2 g
flaky sea salt
garam laut serpih
last-second surface seasoning that preserves distinct crystals
Generated reference - not verified cook evidence.
ChilledDingin
200 g
full-fat cultured sour cream
sour cream full-fat
ready-to-eat cultured dairy that gives cool lactic richness against the brittle hot potato
Generated reference - not verified cook evidence.
Watch: Contains milk; keep at 5°C or colder.
SpicesRempah
1 g, about 1/2 tsp
freshly ground black pepper
lada hitam yang baru digiling
quiet warmth in the cold sauce
Generated reference - not verified cook evidence.
Calculated estimate · per serving
Nutrition information
1 of 4 servings: 300 g raw-weight potato allocation plus one-quarter of the cultured cream; no additional main or side included
- Energy
- 2010 kJ480 kcal
- Protein
- 7.9 g
- Carbohydrate
- 55 g
- Sugars
- 5 g
- Dietary fibre
- 6.8 g
- Total fat
- 25.1 g
- Saturated fat
- 7.1 g
- Sodium
- 650 mg
How this estimate was calculated
Calculated from the authored edible ingredient weights using representative AFCD Release 3 and USDA FoodData Central profiles, then divided by the recipe yield. Energy follows the FSANZ ingredient-contribution method. Optional serving accompaniments are excluded. The calculation uses representative floury potato and full-fat sour-cream profiles, assumes 85% of the infused oil remains on the tray and potatoes, and estimates that 2 g of the 20 g salt in discarded parboiling water plus all sauce and flaky salt are eaten.
Calculated estimate only, not a laboratory result or personalised dietary advice. Actual values vary with brands, produce, meat trim, substitutions, final serving size, and how much cooking or rendered oil is left in the pan or skimmed. Check packaged labels for allergens and sodium; consult an accredited practising dietitian or clinician for medical dietary needs. Oil left on the tray, potato variety, sauce portion, and salt absorbed from the discarded cooking water are the largest uncertainties.
Reference data: Australian Food Composition Database · FSANZ calculation method · USDA FoodData Central · calculated 2026-07-14
02 · Method
Cook in order. Read the decisive cue.
6 stages · 1 hr 35 min total
Stage 01
Heat the tray and perfume the oil
Heat a centre oven rack to 190°C, preferably fan-assisted, with the dry heavy tray inside for at least 25 minutes. Combine oil, garlic, and rosemary in a small saucepan. Warm gently for about 3 minutes until garlic is only pale straw. Strain and keep aromatic oil and crisp solids separately.
- Move on when
- Oil smells clearly of rosemary and garlic, but neither aromatic is brown.
- Common mistake
- Brown garlic tastes bitter; leaving solids through the full roast burns them.
- Recovery
- Move the pan off heat, scrape only the unburnt paste into a clean spot, add a small splash of oil or liquid, and restart gently.
Stage 02
Alkaline-parboil the potato
Bring water to a full boil. Add 20 g of the measured fine salt and reserve 2 g for sauce. Stir in baking soda, then carefully add potato. Return to a controlled simmer for 12-16 minutes, checking from 10 minutes onward.
- Move on when
- A thin knife enters with slight resistance and the exterior looks softened and fissured.
- Common mistake
- Do not wait for chunks to break apart; varieties soften at different rates.
- Recovery
- Pause before the next step, compare the cue, then correct heat, moisture, or seasoning while the dish is still flexible.
Stage 03
Steam-dry, rough, and smash
Drain thoroughly for 2 minutes. Return potato to the warm empty pot and let steam escape. Add infused oil and make 6-8 decisive folds so starchy paste coats chunks. Press each gently to about 2.5 cm thick. Transfer carefully to the hot tray with at least 2 cm between pieces.
- Move on when
- Potatoes look dry and craggy, with broken edges and a thick starchy coating.
- Common mistake
- Crowding traps steam; smooth wet or paper-thin pieces become soft or dry.
- Recovery
- Spread the food out, raise heat only after moisture drops, and hold back extra sauce until the pan is frying again.
Stage 04
Set the first crust untouched
Roast without opening the oven or moving the potatoes. At 25 minutes, test one edge with a thin metal spatula.
- Move on when
- The underside is rigid, light golden, and releases as one crust.
- Common mistake
- Turning early tears away the coating before it dehydrates and sets.
- Recovery
- Pause before the next step, compare the cue, then correct heat, moisture, or seasoning while the dish is still flexible.
Stage 05
Turn and finish golden
Flip every piece. Roast 20 minutes, then inspect in 5-minute intervals until crisp and light-to-medium golden. Turn pale pieces once more. Remove and immediately toss with reserved garlic-rosemary solids and flaky salt.
- Move on when
- Edges sound brittle against the tray and a broken piece reveals a fluffy steaming centre.
- Common mistake
- Do not chase very dark colour; food-safety guidance recommends light-golden roast potato.
- Recovery
- Pause before the next step, compare the cue, then correct heat, moisture, or seasoning while the dish is still flexible.
Stage 06
Season the cultured cream and serve
Mix sour cream with lemon zest, 15 ml juice, chives, black pepper, and reserved 2 g fine salt. Keep cold. Spoon small dollops beside the potatoes, leaving most crust exposed, and serve immediately. Cool and refrigerate leftovers within 2 hours for up to 3 days; reheat once at 190°C until crisp and at least 60°C. Keep sauce separate.
- Move on when
- The cream holds soft peaks and tastes tangy, herbal, and properly seasoned beside dry crust.
- Common mistake
- Blanketing potatoes or plating on a sauce pool softens crust within minutes.
- Recovery
- Reduce uncovered and season in small rounds, checking the visual cue before adding more salt, sugar, or sauce.
03 · Source & shop
Where the guidance comes from.
Technique guidance is stable editorial material. Prices, stock, and local availability should be rechecked before a special trip.Melbourne
- Look for loose Sebago or brushed potatoes at Queen Victoria Market, a CBD greengrocer, Coles, Woolworths, or IGA. Russet or labelled roasting potatoes are also suitable.
- Mr Dad Queen Street is a nearby browse lead for garlic, lemon, herbs, and pantry items, but current inventory must be checked rather than assumed.
- Full-fat sour cream, baking soda, rice-bran or canola oil, and flaky salt are standard supermarket lines; check the exact dairy allergen label.
- Fresh rosemary and chives are usually better from a high-turnover market or greengrocer than a low-turnover herb packet.
Jakarta
- Ask for kentang tes or Atlantic for the driest result. Mature firm Granola is a practical fallback but needs extra drying.
- Premium supermarkets are practical leads for sour cream, imported herbs, lemon, and speciality salt; verify stock and cold-chain condition.
- Pasar produce stalls suit potato and garlic. Avoid green, sprouted, damaged, or bitter potatoes.
- For baking soda, confirm the package says soda kue or natrium bikarbonat, not baking powder.
Editorial provenance
Serious Eats - The Best Roast Potatoes Ever
Cross-checks floury potatoes, mildly alkaline parboiling, steam drying, roughened starch, infused oil with strained aromatics, generous spacing, and a long two-sided roast.
Supports: alkaline parboil, rough starchy exterior, infused-oil roast sequence.
Boundary: Bumbu Lens uses a thicker smashed format, a lower light-golden colour target, and a cold cultured-cream accompaniment; it is an original synthesis rather than a copied or award-winning formula.
Reviewed 2026-07-10MICHELIN Guide - Heston Blumenthal's triple-cooked chips
Cross-checks the restaurant principle that a soft potato interior is dried before a separate high-heat crisping stage.
Supports: soft-centre dry-before-crisp principle, separate moisture-removal stage, restaurant-technique context.
Boundary: Triple-cooked chips are not smashed roast potatoes. This source informs a transferable moisture-control principle, not the recipe's shape, oil quantity, or award status.
Reviewed 2026-07-10Food Standards Australia New Zealand - Acrylamide and food
Supports a light-to-medium golden endpoint instead of chasing very dark roast colour in starchy food.
Supports: light-golden colour target, avoid excessive browning, starchy-food risk context.
Boundary: Colour is a practical risk-reduction cue, not a complete measurement of acrylamide or overall nutritional quality.
Reviewed 2026-07-10Food Standards Australia New Zealand - Cooling and reheating food
Applies rapid cooling in a shallow layer and prompt refrigeration to par-cooked or leftover potatoes, with rapid reheating rather than warm holding.
Supports: ahead-of-time cooling, shallow-layer storage, rapid reheating.
Boundary: Crispness is a quality outcome, not a safety test; sauce and potato should be cooled and stored separately.
Reviewed 2026-07-10Generated reference image · not verified cook evidence
Recorded as a local editorial or generated visual cue asset, not an independent external source.
Supports: finished-dish appearance, image credit boundary.
Boundary: A local or generated asset is visual guidance, not evidence of authenticity, ingredient quantities, timing, safety, or method accuracy.
Reviewed 2026-07-10Bumbu Lens editorial method audit
Reviewed Ultra-Crispy Smashed Potatoes as an ordered cook flow with visual cues, common mistakes, and recovery notes.
Supports: method sequence, visual checkpoints, mistake and recovery notes.
Boundary: Use this as editorial guidance; run a tested-kitchen pass before publishing nutrition, safety guarantees, or commercial pack quantities.
Reviewed 2026-07-10Bumbu Lens Melbourne/Jakarta sourcing heuristic
Mapped ingredient groups to likely Melbourne grocer, supermarket, butcher, pasar, and Jakarta supermarket paths.
Supports: Melbourne sourcing, Jakarta sourcing, volatile availability boundary.
Boundary: Ingredient availability, price, and store stock change; verify with local grocers before travel, bulk shopping, or holiday cooking.
Reviewed 2026-07-10Your next cook
Kitchen notes
Record the batch size, timing, substitutions, and visual cue you want to remember next time.