Combine water, sugar, yeast and oil in 6 quart mixer bowl; blend with dough hook. Sauté onion in butter; add to water mixture. Add remaining ingredients and let machine knead dough until it separates from the side of the bowl. You may need to add a touch more flour if dough is too sticky. Let rise in oiled bowl. When it has doubled in size, punch down dough and let rise again. Form into two loaves and let rise in well-greased bread pans. Bake at 350 degrees for 35 minutes. Makes 2 loaves (12 slices each).