Prepare the sauce. Prepare the following, adding them all to a small bowl: Finely grate the zest of 1 medium lemon, then grate 1 garlic clove. Juice the lemon until you have 2 tablespoons juice. Finely chop until you have 2 tablespoons fresh mint leaves and 2 tablespoons fresh parsley leaves. Add 1/3 cup olive oil, 1/2 teaspoon of the kosher salt, and 1/4 teaspoon red pepper flakes if desired, and whisk to combine.