In a medium bowl, whisk together the Greek yogurt, lemon juice, olive oil, dill, mint, garlic (if using), salt, and black pepper.
¼ cup Greek yogurt, 1 tbsp lemon juice, 1 tsp olive oil, 1 tbsp dill, 1 tbsp mint, ½ garlic clove, 1 pinch salt, 1 pinch black pepper