Lemon Mayonnaise A great addition to any sandwich. Yields: 1-1/4 cup Ingredients: 1 cup mayonnaise 2 tablespoons sour cream 1 tablespoon freshly grated lemon zest 2 teaspoons coarse-grained mustard 2 teaspoons fresh lemon juice, or to taste In a small bowl stir together mayonnaise, sour cream, zest, mustard, lemon juice, and salt and pepper to taste.