1: Preheat barbeque grill to high. Cut the stem end off the garlic heads and place each root side down in centre of two 8” x 10” (20cm x 25cm) pieces of foil. Drizzle each one with 1 tsp (5mL) oil and sprinkle with salt.
2: Wrap up tightly and place directly on grill. Cook 20-30 minutes, turning occasionally, until soft. Let cool. Remove from foil and squeeze out cloves from one head of garlic into a medium sized bowl. Set aside remaining garlic head for aioli.
3: Heat 2 tbsp (30mL) oil in small skillet over medium heat. Add 4 cloves of minced garlic, reduce heat to low and cook for about 5 minutes, being careful not to let the garlic brown. Let cool and add to bowl with roasted garlic.
4: Add ground beef, steak spice, salt and pepper and mix to combine. Form into 6 patties. Lightly brush one side of each patty with oil. Place oiled side down on hot grill and then oil top side. Cook, about 5 minutes per side or until an internal temperature of 160°F (71°C) is reached.
5: Place on bun and top with toppings.