Spinach and Feta Turkey Burgers with Sun-Dried Tomato Tzatziki Sauce

Ingredients

• 2 teaspoons lemon zest
• 2 garlic cloves
• 1 teaspoon lemon juice
• 1/2 teaspoon kosher salt
• 1 teaspoon garlic powder
• 1 pound ground turkey
• 1/2 teaspoon fresh ground pepper
• 1/2 cup crumbled feta cheese
• kosher salt and fresh ground pepper (to taste)
• 1 cup plain low-fat greek yogurt
• 1 cup chopped fresh baby spinach
• 1/2 teaspoon chopped oregano
• 1/2 cup chopped sun-dried tomatoes (rehydrated in hot water and drained)
• 1 teaspoon fresh oregano
• 4 whole wheat hamburger rolls