1 cup frozen cranberries (you can substitute juice, around 1/2 – 3/4 cup but it adds a bunch of preservatives and crap)
1 medium orange, seeded, peeled and skinned, then divided into sections.
Zest of 1 medium orange
1 cup unsweetened orange juice
1/2 cup skim milk
small handful of fresh spinach leaves
Combine spinach, cranberries, oranges, and orange juice.
Blend until thick but smooth. Add more juice by the tablespoon if needed to thin out the cranberries enough to blend.
Add remainder of ingredients and mix until smooth.