4 yellow squash, sliced
4 medium tomatoes, sliced
2 green onions, chopped
2 tablespoons red wine vinegar
2 tablespoons olive oil
1 tablespoon Dijon mustard
1/2 teaspoon salt
1/4 teaspoon freshly ground black pepper
Preheat oven to 400 degrees F (200 degrees C). Lightly grease a 1 quart casserole dish.
Alternate slices of the squash and tomatoes in the prepared casserole dish, and sprinkle with green onions. Mix the vinegar, oil, mustard, salt, and pepper in a bowl, and drizzle over the vegetables.
Bake 15 minutes in the preheated oven, or until squash is tender. Cool 15 minutes before serving.