Grilled Spinach Feta Burgers

Directions

• In a large skillet, heat oil over medium-high heat. Add shallots; cook and stir until tender, 1-2 minutes. Add spinach and garlic; cook until spinach is wilted, 30-45 seconds longer. Transfer to a large bowl; cool slightly.
• Stir feta cheese and seasonings into spinach. Add beef; mix lightly but thoroughly. Shape into eight 1/2-in.-thick patties.
• Grill burgers, covered, over medium heat until a thermometer reads 160°, 6-8 minutes on each side. Grill buns over medium heat, cut side down, until toasted, 30-60 seconds. Serve burgers on buns. If desired, add toppings.
  Freeze option: Place patties on a baking sheet lined with plastic wrap; wrap and freeze until firm. Remove from pan and transfer to a freezer container; return to freezer. To use, cook frozen patties as directed, increasing time as necessary for a thermometer to read 160°.