Marinated Onion Salad

Ingredients

• 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)