Tropical Shake
["1 medium-size ripe banana, cut into 1-inch slices", "2 tsp. lemon juice", "1 medium mango, peeled and cut into pieces", "1 1/2 c. pineapple-orange juice, chilled", "1 (8-oz) container nonfat vanilla yogurt"]
["Toss banana with lemon juice; drain, reserving lemon juice. Place banana slices on a baking sheet, and freeze 1 hour and 30 minutes.", "Process banana slices, reserved lemon juice, mango, 1 1/2 cups pineapple-orange juice, and yogurt in a blender until smooth, stopping to scrape down sides.", "Pour into chilled glasses; serve immediately."]
["banana", "lemon juice", "mango", "pineapple", "vanilla yogurt"]