Ingredients

• 3 teaspoons red wine vinegar
• 1 teaspoon Dijon mustard
• 1/2 cup salad oil
• Salt and black pepper
• 2 heads romaine lettuce
• 2 tomatoes
• 1 red onion

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Instructions

1. In a bowl, whisk together the vinegar, mustard, oil, salt and pepper and set aside.
2. Chop the romaine lettuce and place in a large bowl. Cut the tomatoes into wedges and the red onion into thin slices and add to the bowl. Just before serving, toss the salad with the mustard vinaigrette.