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Best Ever Grilled Onions Recipe

4.5 from 52 reviews

This Best Ever Grilled Onions recipe delivers tender, sweet, and perfectly charred onions every time. Using a skewer to hold thick slices together, these sweet onions are brushed with olive oil, seasoned, and slow-grilled on a charcoal or gas grill until golden brown and tender. Perfect as a side or topping for burgers and steaks, these grilled onions bring out a deep, caramelized flavor with effortless preparation.

Ingredients

Scale

Ingredients

  • 2 sweet onions (such as Walla Walla or Vidalia)
  • 1 tablespoon olive oil
  • Kosher salt, to taste
  • Fresh ground pepper, to taste

Instructions

  1. Prepare the onions: Hold one onion on a cutting board with the root end facing sideways. Insert a wooden skewer lengthwise through the center of the onion, about 3/4 inch from the root end, pushing it all the way through so the flat end rests against the onion and the pointy end extends outward.
  2. Slice the onion: On one side of the skewer, slice off the root end of the onion. On the other side, slice the onion into even slices about 3/4 inch thick, ensuring the skewer remains through the center of each slice to hold them together.
  3. Trim the skewers: Cut the protruding part of the skewer so no excess sticks out from the onion slices. Repeat this process to slice both onions fully.
  4. Season the onion slices: Brush both sides of each onion slice generously with olive oil. Season with kosher salt and freshly ground pepper to taste.
  5. Prepare your grill – charcoal method: Set up a two-zone fire with charcoal on one side and no coals on the other. Place the onion slices on the cooler side of the grill to cook indirectly.
  6. Grill on charcoal: Flip and rotate the onion slices every 10 to 15 minutes to ensure even cooking and caramelization. Grill for 25 to 40 minutes or until the onions are golden brown and tender. The cooking time depends on the heat intensity and the distance from the coals.
  7. Prepare your grill – gas method: Heat the gas grill for 5 to 10 minutes, then lower the burners to low heat. Place the onion slices on the grill over the low burner.
  8. Grill on gas: Cook the onions slowly, flipping every 10 minutes, for about 25 to 40 minutes until they turn golden brown and are tender. Adjust cooking time based on your grill’s temperature.
  9. Serve: Remove the grilled onions from the grill and serve immediately as a flavorful side dish or topping.

Notes

  • Using sweet onions like Walla Walla or Vidalia enhances the natural sweetness after grilling.
  • The skewer technique keeps onion slices intact and easy to flip during grilling.
  • Adjust grilling times depending on your grill’s heat and how caramelized you want your onions.
  • For added flavor, sprinkle a little smoked paprika or balsamic vinegar after grilling.

Keywords: grilled onions, sweet onions, Walla Walla onions, Vidalia onions, grilled side dish, easy grilled recipe, barbecue side