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To make a dressing, mix the vinegar, 2 tsp of the oil, the garlic and herbs in a small bowl. Heat a griddle pan. Brush the lettuces in the remaining oil and cook on the griddle for 3 mins each side until charred. Bring a small pan of water to the boil, add the peas and cook for 3 mins. Drain the peas and mix with the lettuce and dressing. Serve straight away.