Lemon, with some peel

Vitamin C, sharp flavor, and polyphenols.

Whole lemon and halved lemon showing bright yellow flesh on white background — André Karwath aka Aka · CC BY-SA 2.5

A squeeze of lemon plus a strip of peel adds vitamin C, a bright acid note that cuts through the fat and bitterness of the greens, and polyphenols from the zest. The peel is worth including — it carries more flavonoids than the juice.

In the recipe

core ¼–½ Flavor Savory Green Morning Shake