Yogurt dill sauce (for falafel)

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I got the idea for making homemade falafel from this excellent blog, which was also the source for the garlic scape and basil pesto recipe. Here's Andrea's yogurt dill sauce that goes on top of the falafel, though I made a half recipe. It's good, and healthy too!

1/2 cup plain yogurt (I used Greek yogurt)
1 small clove of garlic, minced
3/4 tbsp. fresh dill, minced
1/4 tsp. lemon zest, minced
1/2 tsp. lemon juice
salt and pepper