For onion: oil space where the onions will sit. Brush a little oil on the onions. Add to grill, sprinkle with salt and pepper, and grill until grill marks appear and turn, repeat. Remove from grill as finished.
Step 2
For burgers: Place burgers on the hottest part of the grill and cook, undisturbed, for about 5 to 6 minutes. Turn and cook for an additional 2-3 minutes for rare to medium-rare.
Step 3
For buns: Brush cut side with oil. Toast carefully.