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Grilled onion slices on a metal baking dish.
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5 from 1 vote

Grilled Onions

These Grilled Onions are a sweet and tasty treat that come off the grill with a beautiful caramelization. They're awesome on top of burgers or steaks, or chopped up in a variety of recipes. In fact, these onions are so sweet, you can eat them as-is for a unique and tasty side!
Prep Time15 minutes
Cook Time10 minutes
Total Time25 minutes
Course: Side Dish
Cuisine: American, Barbecue
Keyword: Grilled Onions
Servings: 6
Author: Susie Bulloch (heygrillhey.com)


  • 3 large sweet onions like vidalias

Grilled Onion Marinade

  • ¼ cup olive oil
  • ¼ cup balsamic vinegar
  • 2 Tablespoons honey
  • 2 teaspoons dried thyme
  • 2 teaspoons kosher salt
  • 1 teaspoon black pepper


  • Preheat. Preheat the grill to 400 degrees F.
  • Prepare your onions. Slice the root end off of your onions and peel the skin off of the exterior. Slice the onions into 1/2 inch thick slices, keeping the rings together. Discard the end slices on each onion.
  • Skewer the onions. Carefully slide a metal skewer through the center of the onion slices. This is easier when you press the onions down onto a board with the palm of your hand and sliding the skewers into the onions parallel to the board. Repeat until all of the onions are on the skewers.
  • Season the onions. Set the onions flat on a rimmed baking sheet. In a medium bowl, combine the ingredients for the marinade. Pour the marinade over the sliced onion, turning the skewers to coat the onions on both sides.
  • Grill the onions. Place the onions on the preheated grill grates. Grill for 4-5 minutes per side. Baste the onions with the remaining marinade during the grilling process. The onions will darken and slightly char as the sugars in the marinade caramelize, but you don't want them to burn. Move the onions off of the heat if they are getting too hot. Once the onions are cooked to your liking, remove them from the grill and serve warm. The onions should be grilled on the exterior, but still retain their shape and structure.
  • Serve immediately. Serve on their own, on a burger, or on top of a steak for a sweet and savory flavor punch.



Calories: 76kcal | Carbohydrates: 19g | Protein: 1g | Fat: 1g | Saturated Fat: 1g | Sodium: 14mg | Potassium: 208mg | Fiber: 2g | Sugar: 14g | Vitamin A: 16IU | Vitamin C: 8mg | Calcium: 41mg | Iron: 1mg