1 Grill the burgers on the medium-hot side for 4 minutes without disturbing. 2  Flip the burgers over and continue to cook on the same side of the grill for another 3 minutes. 3  Then shift the burgers over to the medium heat side of the grill well away from the direct heat coming from the fire. Place the burgers on the pre-heated grill, top side down. 2  Except when the burgers are being flipped over, the barbecue lid should remain closed during grilling. 3  Grill burgers for 4 minutes without disturbing. 4  Open the barbecue lid, flip the burgers over and cook the opposite side for 3 minutes.