Lesson 1
The Science of High-Heat Roasting
Understand why temperatures between 200°C and 220°C are crucial for achieving caramelised results.
Oven Dynamics
To achieve crispy vegetables, you must facilitate moisture evaporation before the vegetable softens completely. Setting your oven between 200°C (400°F) and 220°C (425°F) provides the necessary thermal energy. If the temperature is too low, the vegetables steam in their own released juices rather than roasting.
The Single Layer Rule
Crowding a baking tray is the most common error. When pieces touch, steam is trapped between them, leading to a mushy texture. Ensure every piece has space on the tray. If you have a large quantity, use two trays rather than piling them up.
Worked Example
For cubed butternut squash, toss in 30ml (2 tbsp) of oil and salt. Spread on a preheated tray to ensure the base begins sizzling immediately upon contact. Roast at 210°C (410°F) for 30 minutes, turning halfway through. The result should be dark golden edges and a tender, creamy centre.