Melon Shakes

1  cup cubed watermelon

1  cup cubed cantaloupe

1  cup cubed honeydew melon

1  cup low-fat yogurt

2  tablespoons lemon juice

⅓ teaspoon vanilla extract

⅓ cup crushed ice

Combine the watermelon, cantaloupe, and honeydew in a blender container; process until smooth. Slowly blend in a mixture of the yogurt, lemon juice, vanilla, and crushed ice; process until smooth. Serve immediately.

Yield: 4 to 6 servings