Greek-Inspired Burgers With Herb-Feta Sauce

Ingredients

• 1 cup nonfat plain Greek yogurt
• ¼ cup crumbled feta cheese
• 3 tablespoons chopped fresh oregano, divided
• ¼ teaspoon lemon zest
• 2 teaspoons lemon juice
• ¾ teaspoon salt, divided
• 1 small red onion
• 1 pound ground lamb or ground beef
• ½ teaspoon ground pepper
• 2 whole-wheat pitas, halved, split and warmed
• 1 cup sliced cucumber
• 1 plum tomato, sliced