Recipe(tried): Zucchini, Summer (Yellow) Squash, and Tomatoes (repost)

How about this vegetable side dish?? You might be able to do it in a casserole so there isn't last minute cooking at the stove, though the dish as it stands, is pretty simple.

Zucchini, Summer (Yellow) Squash, and Tomatoes

2 Tbl. butter or margarine
2 slices onion
2 zuchinni, sliced crosswise, or roll cut(like often done in Chinese recipes)
2 Summer Squash, sliced or cut the same way as
the zuchinni
1 Tbl. water
1 Tomato, cored. cut in half and cut into about
1 inch pieces
2-3 Tbl. freshly grated Parmesan cheese
2 Tbl. fresh basil, chopped

Melt butter over low heat in frying pan. Increase heat to medium and add onions, zucchini, summer squash and water. Cover and cook until squash is just crisp tender, about 3- 5 minutes, stirring with a spatula a few times. Remove from the heat and add the tomato pieces and the parmesan cheese. Keep covered until the tomatoes are warm and the cheese is melted. Add the fresh basil and serve warm.