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Get a bowl of iced water at the ready and bring a large pan of salted water to the boil. Cook the asparagus in the water for 3 mins, then scoop into the iced water with a slotted spoon. Cook the peas for 2 mins, then place in the iced water. Cook the broad beans for another 2 mins, pop into the iced water, then remove them from their skins. Cut a cross in the bottom of each tomato, then blanch in boiling water for about 10 secs before placing in iced water. Peel, quarter and deseed the tomatoes and cut the flesh into small chunks.
Heat the oil and coriander seeds gently in a small saucepan, then take off the heat and stir through all the veg and the vinegar. Season with salt and pepper, and stir through the tarragon and mint.