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Preheat a well-oiled grill to medium-high heat. (TIP: If using a grill pan, you’ll heat it in step 5.) Wash and dry produce.
Halve, peel, and slice onion; mince a few slices until you have 1 TBSP (2 TBSP for 4 servings). Place sliced onion in the center of a large piece of foil; drizzle with oil and season with 1⁄4 tsp sugar (1⁄2 tsp for 4), salt, and pepper. Cinch into a packet. Quarter lemon. Mince pickle until you have 1 tsp (2 tsp for 4). Thinly slice tomato into rounds. Halve buns.
PAN ALTERNATIVE: Skip the foil packet instructions. (You’ll cook the sliced onion in step 5.)