Citrus Salad

Ingredients

• 1 grapefruit, peeled
• 1 orange, peeled
• 10 cups lettuce
• 1 small red onion, sliced
• 2 tablespoons cider vinegar
• 1 tablespoon lime juice
• 1 tablespoon vegetable oil
• 1 tablespoon water
• 1/4 teaspoon black pepper
• 1/4 teaspoon cumin, ground