Pineapple Ginger Smoothie

2 cups unsweetened pineapple chunks, partially thawed
1 orange, peeled, seeded, and quartered
1 (1-inch) piece of fresh ginger, peeled and chopped 
3 tablespoons fresh lemon juice (from 2 lemons)
Dash of cayenne pepper (optional)

Put the pineapple, orange quarters, ginger, and lemon juice in a blender.
Ad 1/2 cup ice, 1 cup cold water and the cayenne.
Puree until smooth and serve immediately