Offer: magazine subscription
Try your first 5 issues for only £5 today and never miss our best recipes
Heat oven to 190C/170C fan/gas 5. Toss the peppers and onions with the garlic and olive oil, and spread out in a roasting tin. Roast for 40 mins, then add the tomatoes, red wine vinegar and sugar, and roast for another 20 mins. Tip into a food processor and blend until smooth. Season to taste.