Greek Sweet Potato-Lamb Burger Salad

Ingredients

• 1 medium sweet potato
• Cucumber Yogurt Sauce (see recipe to the right)
• 2 cloves garlic (peeled)
• 1 cup loosely packed fresh parsley
• 1 red onion (½ chopped, ½ sliced very thin; divided)
• 8 ounces ground lamb
• ¼ cup cornmeal
• 1 egg
• 1 teaspoon cumin
• ½ teaspoon oregano
• ½ teaspoon salt
• ¼ teaspoon chili powder
• ¼ teaspoon ground black pepper
• 1 tablespoon olive oil
• 10 ounces baby spinach
• ½ cup pitted and halved kalamata olives
• 2 whole-wheat pitas cut into wedges