step 1
Preheat the oven to 220˚C, gas mark 7. Rub the peppers with 1 tbsp oil and arrange, skin-side up, in a single layer in a roasting tin. Roast for 25-30 minutes, turning occasionally, until the skins are blistered and blackened in places. Tip into a heatproof bowl, cover with a plate and set aside to cool.