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Preheat the oven to 180c.
Toss the peppers and tomatoes in the olive oil, put on a baking tray and roast for 15min, till the edges of the peppers begin to darken.
While the peppers and tomatoes are cooking, add the peas to a pan and cover the in twice their height with cold water. Bring to a simmer over a medium-low heat. Check after a few minutes to see if cooked. - you are looking for the peas to have some crunch but you can crush them between your fingers - once this has been reached, drain.