This is a nice small side dish, or a swell topping for steak, hamburgers or hot dogs. It's worth making just for the aroma.
3 tbsp. olive oil or butter
1 large onion, peeled and chopped coarsely
1 large bell pepper, cored, seeded and sliced thin
1 lb. mushrooms, brushed or wiped clean, and quartered (small ones halved)
½ tsp. salt
Pepper to taste
¼ tsp. hot pepper sauce, or to taste