Marinated Onion Salad

• 1 large sweet onion, sliced (1015's or Vidalia type)
• 1 1/2 lbs ripe tomatoes, sliced
• 1 cucumber, peeled and sliced
• 1/2 cup vegetable oil
• 1/4 cup wine vinegar
• 1 teaspoon Dijon mustard
• 1/2 teaspoon salt
• 1/4 teaspoon black pepper
• 1/4 teaspoon sugar
• 1/4 cup fresh basil, chopped
• parmesan cheese (optional) or crumbled blue cheese, for garnish (optional)

1. Place half of the onion rings in a large, shallow casserole. Layer the tomato and cucumber slices over the onion and top with the remaining onion rings.
2. In a small bowl, combine the oil, vinegar, mustard, salt, pepper and sugar. Whisk.
3. well to blend. Pour over vegetables.
4. Top with fresh basil. Cover and let marinate several hours in refrigerator.
5. Top with cheese before serving.

sweet onion, tomatoes, cucumber, vegetable oil, wine vinegar, mustard, salt, black pepper, sugar, fresh basil, parmesan cheese

Taken from www.food.com/recipe/marinated-onion-salad-156303 (may not work)