Proper timing is essential with pressure cooker risotto. If you cook it too long, you end up with a sticky, glutinous pot of mush. Better to undercook the rice and simmer it on the stovetop for a few minutes. During this final cooking, you can stir in wild mushrooms, fresh spinach, or slices of thin asparagus, almost any cheese, diced tomato or ham, chopped olives, scallops or small shrimp, or fresh herbs.
