Smoky Lamb With Spiced Yogurt

Name: Smoky Lamb With Spiced Yogurt
Ingredients: 3 Tbsp. (or more) extra-virgin olive oil; 1 Tbsp. smoked paprika; 1½ cups plain whole-milk Greek yogurt; 6 garlic cloves, finely grated, divided; 1½ tsp. Diamond Crystal or ¾ tsp.Morton kosher salt, divided, plus more; 2 small red onions, 1 finely chopped, 1 thinly sliced; 2 tsp. ground cumin; 1 tsp. sugar; 1 lb. ground lamb or ground beef (preferably 10% fat); 2 Persian cucumbers, thinly sliced; ½ cup (lightly packed) parsley leaves with tender stems; Warm pitas (for serving)