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Heat the oil in a large frying pan and bring a large saucepan of salted water to the boil. Gently fry the shallots and garlic for 5-8 mins, tip in the stock and peas, then bubble for a few mins until the peas are cooked.
Meanwhile, boil the rest of the veg, cooking the broccoli and asparagus for a couple of mins first, then throwing in the mangetout for the final min. Drain well and tip into the pan with the peas. Season, add the butter and mix well.