Grate the cucumber and add it into a bowl along with yogurt, minced garlic, the juice of half of a lemon and the seasonings.
2 cups plain nonfat Greek yogurt, 1/2 cup grated cucumber, 1 to 2 Tbsp minced garlic, 1/2 lemon, 1 tsp salt, 3/4 tsp pepper, dash garlic powder, dash onion powder