Cut 4 red onions into wedges and quarter 8 bacon strips. Toss with 6 oregano sprigs, 1 tablespoon olive oil, 2 teaspoons red wine vinegar, 8 garlic cloves, and salt and pepper. Divide between 2 large pieces of foil; seal into flat packets. Grill over high heat, 15 minutes. Let rest before opening.
Photograph by Con Poulos