Preheat grill to high + oil grates; cut off the stem of 1 onion, discard outer skin, then carefully slice onion into ¼ to ½-inch rounds; drizzle with oil + salt/pep; grill 5 min with lid closed, flip + grill 4-6 min until charred + slightly softened

Meanwhile, form 2 patties using ½ package of beef; season with salt/pep + seasoning packet; grill 6 min with lid closed, flipping over halfway, until cooked throughout

Toast 2 buns until warm + golden; wash + dry lettuce; add a few lettuce leaves to each bun

Add burgers to buns with grilled onions; top each with 2 tbsp sauce—time to eat!