06/26/2026
Get the recipe for Evergreen Pesto here: https://bit.ly/4uXmuTZ
You can, in fact, keep pesto bright green for days. Basil is Genovese pesto's essence, but also its biggest liability—it oxidizes fast, quickly turning muddy and dull. Milk Street recipe developer Hisham Ali Hassan tested a few solutions.
First, swap in some arugula, a hardier green that retains its color far longer than basil alone, and it's peppery, so it doesn't dilute piquancy. Second, add lemon juice—its ascorbic acid acts as a natural antioxidant, slowing the browning. And third, cover the surface with a thin layer of oil before storing to create a barrier between the pesto and oxygen.