Turkey-Apple Burgers with Cider-Glazed Onions - Tufts Health & Nutrition Letter

Ingredients

• 2 tsp canola oil
• 1 3/4 cup thinly sliced onion
• 1 1/4 cup apple cider
• 1/4 tsp dried thyme leaves
• 1/4 cup nonfat plain Greek yogurt
• 6 tsp whole-grain mustard
• 12 ounces 99% extra-lean ground turkey
• 1 cup shredded apple
• 1 tbsp Worcestershire sauce
• 1/4 tsp pepper
• 1 tbsp maple syrup
• 4 large whole-wheat hamburger rolls
• 1 1/2 cup spinach leaves, trimmed, washed, and dried