Banana Berry Shake

This cool, creamy shake is just the thing for a hot afternoon
� frozen banana slices cleverly take the place of ice cream.
The shake is also a great source of vitamin C and calcium.
Serves four. 

1 large banana, peeled and cut in 1/2-inch slices
  1 teaspoon lemon juice 
1-1/2 cups strawberry frozen yogurt 
1 cup frozen strawberries (unsweetened)
  1 cup skim milk 
1 teaspoon vanilla 

Toss banana slices with lemon juice.
Place on a baking sheet.
Cover; place in freezer 1 hour. 
Combine all ingredients in a food processor or blender.
Process until smooth, scraping sides several times.