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Heat oven to 200C/180C fan/gas 6. Put the peppers and onion in a roasting tin and drizzle with half the oil. Roast for 20 mins, adding the tomatoes for the final 5 mins. Leave to cool.
Cook the orzo following pack instructions, then run under cold water to cool before draining thoroughly. Toss with the vegetables, the remaining oil, the feta and basil. Will keep in the fridge for a few days.