Place the following ingredients in a blender
- a handful of mixed berries
- a couple of sprigs of mint
- a chunk of cucumber about 3 inches long
- a teaspoon of spirulina powder (you can buy this in health food shops or substitute with a handful of spinach leaves of just leave it out)
- juice of half a lime
- an egg white (optional if you want to up the protein, read why here)
Blend all of the ingredients until smooth, you could blend with ice if it was a warm day, and serve.