Preheat an outdoor grill for high heat. Mix together the ground beef, garlic, olive oil, salt, pepper, and basil. Divide into four balls, and flatten into patties. Make a thumb imprint in the middle of each patty so they cook level.
Cook the patties for about 3 to 5 minutes on each side, or to desired doneness. The internal temperature should be at least 160 degrees F (70 degrees C). Remove from grill and place onto hamburger buns. Top with desired toppings and condiments.