Oil smells clearly of rosemary and garlic, but neither aromatic is brown.
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01Ultra-Crispy Smashed Potatoes
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.