Sweet and Sour Onions

6 onions
1/4 cup water
1/4 cup vinegar
1/4 cup granulated sugar
1/2 stick (1/4 cup) butter
Salt and pepper to taste

Slice onions 1/4 inch thick. Place in casserole with tight lid. Add other ingredients and bake one hour covered and 1/2 to 1 hour uncovered at 350 degrees F.

Serves 4 to 6.