Prepare the dressing. Peel, then crush a garlic clove. Roughly chop a few stems of dill, until you have about 3 tablespoons. Half a lemon and squeeze 2 tablespoons of lemon juice into a small bowl. Whisk the dressing ingredients together until you have a beautifully smooth and creamy dressing.
4 tablespoon mayonnaise, 3 tablespoon fresh dill, 2 tablespoon lemon juice, 1 small clove garlic, ⅛ teaspoon mustard powder