Wash zucchini well under cold tap water. Cut off ends. Slice 1" thick. Put aside. Cut up bacon in 1" pieces. Put in 2-quart saucepan. Peel and chop onion. Put in saucepan. Add zucchini. Cover pan. Put on medium heat. Cook 15-20 minutes. Stir around 2-3 times during cooking. Add salt and pepper to taste. Serve.