Grapefruit, Walnut and Feta Salad

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• 1 small red grapefruit
• 2 tablespoons extra-virgin olive oil
• 1/2 teaspoon sugar
• 1/8 teaspoon salt
• 1/8 teaspoon black pepper
• 4 cups torn butter lettuce
• 4 tablespoons crumbled feta cheese
• 4 tablespoons toasted walnuts