Add ice cubes to reach 4-cup level. Process until smooth.
Serve immediately.
Strawberry Smoothies: Use 1 1/2 cups sliced strawberries instead of raspberries; proceed with recipe as directed.
Blueberry Smoothies: Use 1 1/2 cups blueberries instead of raspberries; proceed with recipe as directed.
Peach Smoothies: Use 1 1/2 cups fresh or frozen sliced peaches instead of raspberries, use vanilla low-fat yogurt instead of lemon, and proceed with recipe as directed.