Pink-Grapefruit and Avocado Salad

Use a sharp knife to cut skin (and white pith) from grapefruits; cut into segments, reserving juice.

Place lettuce in a large bowl with avocado. Drizzle with 1 to 2 tablespoons reserved grapefruit juice, olive oil, and vinegar. Season with salt and pepper; toss gently. Top with grapefruit segments.