A simple risotto - absolutely no contest. Soften the onions in butter, turn the rice in the onion/butter mixture, add finely chopped mushrooms and stir it round again, then add two cups (or mugs or whatever) of stock for each cup of rice a little at a time and keep stirring as you cook it. You can throw in any cooked meat leftovers you have to heat through at the end, or you can simply serve it and top it with good Parmesan. Good, simple, plain food and a clean cooker!