Throw all ingredients in a blender and mix well. To be fancy, pour the smoothie in a glass and garnish with a lemon slice (as pictured).
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Notes
As always, you are always welcome to experiment with different additions or substitutions, in this case, you could replace the blueberries and blackberries with some strawberries or cherries. Or simply use mixed berries, which you can find in almost every grocery store and are super affordable.