What makes this low-fat BBQ meatloaf speedier than the typical oven version? The reflective surface of the foil packet, which traps and intensifies the heat like a mini silver oven. Plus the loaf is slightly thinner, so it cooks more quickly while maintaining a flavorful char on the surface.
Special equipment: Heavy-duty foil
Prepare a grill for medium-high heat.
Stir together the milk, egg, breadcrumbs, Worcestershire sauce and 1 tablespoon of the barbecue sauce in a medium bowl.
Finely chop the spinach, scallion and garlic together on a cutting board. Transfer to the bowl, along with the ground beef and turkey, 1 teaspoon salt and several grinds of black pepper. Gently combine the mixture well with your hands.
Coat a 20-inch piece of heavy duty aluminum foil all over with cooking spray. Pile the meatloaf mixture onto the foil just off the center and form into a 9-by-5-inch loaf that’s about 1-inch thick. Fold the long half of the foil over the meatloaf, lining up the edges, and crimp and fold tightly to make a sealed packet.
Put the packet on the grill, close the grill lid and cook for 10 minutes. Turn the packet over using 2 large metal spatulas; cover and grill 10 minutes more. Remove and let rest for 5 minutes. Carefully open the packet (hot steam will escape). The meatloaf should have some grill marks and an internal temperature of 165°F. Brush the top and sides of the loaf with the remaining 3 tablespoons barbecue sauce. Cut into slices and serve.