I would never make gnocchi myself (tried it once, it took hours and wasn't worth the effort), but you can get packets in the supermarket which take literally 2 minutes to boil so it's really handy. Normally we make them with a tomatoey sauce (like a pasta sauce for example) but here's a nice light summery way to do them. Serves 2 and takes less than 15 minutes from start to finish.
Warm up some oil in a pan. Slice the onion as finely as you can and add it to the pan. While it fries for 3 or 4 minutes (stir occasionally), chop the tomatoes into dice. Add the tomatoes and the wine to the pan. Once this starts bubbling, let it bubble for a minute or two before turning the heat right down to minimum and putting a lid on. Let it cook gently for about 5 minutes.
While the sauce is cooking prepare the gnocchi according to the pack. When they're ready, drain them and stir them into the sauce. Serve it all with a few salad leaves on the side.