Start with the sauce, and allow it to sit in the fridge while you prepare the other ingredients. In a small bowl, combine the yogurt with the garlic and herbs, and stir well to incorporate. Taste and add more herbs as needed. When you’re happy with it, add the lemon juice and stir vigorously to thin it out. You don’t want it very runny, but just enough to classify it as a “sauce” instead of just yogurt. Cover the bowl and let rest in the fridge to allow the flavors to marinate together.