1. In a food processor or with a mixer, whirl or beat butter/margarine, sugar, and water until creamy. Whirl or beat in flour and rolled oats.

2. With floured fingers, pat dough over bottom of a lightly oiled and flour-dusted 9" cake pan with removeable rim. Bake in a 325'F. oven until rich golden brown, about 40 minutes. Let cool; if made ahead, wrap airtight and hold up to a day.