An easy lunch dish from Jo Pratt here, which made a nice change from sandwiches. Make a lemony mustardy vinaigrette, with the zest and juice of a lemon, some wholegrain mustard, salt, pepper and olive oil. Add a tin of drained and rinsed canellini or borlotti beans (we used Cirio brand, simply the best), a very finely sliced red onion, or some spring onion, a diced red pepper and a tin of drained tuna, flaked into chunks. Mix gently, taste and adjust the seasoning, and then add some finely chopped parsley. Scarcely a recipe, really.