Learning How to Fry Onions for Burgers on a Blackstone Griddle is one of the easiest ways to upgrade your burgers. In just 10–15 minutes, sliced onions cook down into sweet, caramelized perfection that pairs perfectly with burgers, your favorite sandwiches, and more.
Get My Easy Grilling Cookbook Bundle for 75% OFF
Why You’ll Love Fried Onions for Burgers!
We love using our Blackstone Griddle. We have cooked eggs, bacon and salmon on the griddle and everything always comes out perfectly.
We love grilled onions on just about anything. This strong flavored vegetable cooks down to a sweet, caramelized, and tender topping. It amazes me how the flavored completely transforms into something so delicious that I can enjoy by themselves
When preparing to cook onions, they need to be cook just right. We think cooking them on the Blackstone Griddle allows you to perfectly cook them without any recipe disaster.
Why Fried Onions Make Every Burger Better
Fried onions are the ultimate topping to your favorite hamburgers recipe. It pairs perfectly with slice tomatoes, mustard, lettuce, cheese, pickles, and ketchup. Choose onions that are cooked soft or golden and crispy. They add flavor and texture to your burger patties so every bite is mouthwatering.
Take your onion burger to the next level by adding this budget friendly topping that is quick to make on the Blackstone or in a pan.
Ingredients
- Yellow Onions – Slice the onions into thin slices
- Avocado Oil – Feel free to use other type of oil
- Butter – We used unsalted butter
Tools you Need
Having the right tools makes it easy to cook food on your Blackstone Griddle. These are the best tools that we recommend.
How to Fry Onions on Blackstone
Step 1 – Cut and Prepare your Onions – Cut the onions in half with a sharp knife. Then cut the ends off of each half and peel the onions. Slice the onions into thin half moons and separate the rings with your fingers.
Step 2 – Prepare your Griddle – Preheat the Griddle or Blackstone Griddle over medium heat (approximately 350-400 degrees F). Place the onions directly on the hot griddle and place the avocado oil and butter on top. Spread onions into an even layer so they brown instead of steam.
Step 3 – Begin Cooking Onions – Sauté the onions for about 10-15 minutes stirring them every few minutes until the the onions are soft and a light brown color. You can also top the onions with a burger press to speed up the caramelization process as well and the onions will brown quicker.
Step 4 – Perfectly Deep Golden Brown Grilled Onions – Then they are ready to serve with your favorite type of ground beef burger and enjoy.
Expert Tips
- Add Seasoning – You can season them with salt, black pepper, and even garlic to the grilled onions.
- Freeze Saute Onions – Freeze the sauté onion and a airtight container. They can be frozen for about 6 months. When you are ready to serve, thaw in the refrigerator. Reheat in the microwave or in a skillet.
- Cast Iron Skillet – You can also cook these onions in a cast iron skillet oiled with olive oil.
- Gas Grill – Oil the grill grates, place the onions in a foil pack and grill.
Which Onions are Best for Grilling
- Red Onions – Great for burgers, steak, sandwiches, and salads.
- Yellow Onions – Yellow onions have a milder flavor and are great for burgers, stir-fry’s, fajitas, casseroles, and Mexican dishes.
- Sweet Onions – These sweet onions are perfect on pizza, pasta, and sauces.
Ways to Use Grilled Onions
- Burgers – Try it on Butter Burgers, Blackstone Cheeseburgers, Oklahoma Fried Onion Burger and Crack Burgers
- Casseroles – Adds flavor and texture to many casserole recipes
- Mexican Dishes – Add it to Blackstone Street Tacos and Grilled Stuffed Burritos
- Sandwiches – Prime Rib Sandwich and Cuban Grilled Sandwich are even better topped with these grilled onions.
- Stir-Fry’s – Try these grilled onions with Blackstone Teriyaki Chicken Stir Fry
- Side Dish – You can even serve these as a side dish to Chipotle Steak
Frequently Asked Questions
These are best served fresh but you can also place in the fridge for up to 5 days. Heat the grilled onions and add them to your leftover for an amazing lunch the next day.
10–15 minutes on medium heat. Thicker slices may take longer.
Yes. Oil prevents sticking and helps with browning.
Yes. Oil alone works, but butter adds flavor.
Cook over medium heat and stir every few minutes.
Yes. Store in fridge up to 5 days and reheat on skillet.
How to Fry Onions for Burgers
Ingredients
- 2 Yellow Onions
- 1 Tbsp Avocado Oil
- 1 Tbsp Butter
Instructions
- Cut the onions in half. Then cut the ends off of each half and peel the onions. Slice the onions into thin half moons and separate the rings with your fingers.
- Preheat the Griddle or Blackstone Griddle over medium high heat (approximately 350-400 degrees F).
- Place the onions directly on the griddle and place the avocado oil and butter on top. Sauté the onions for about 10-15 minutes stirring them every few minutes until the the onions are soft and a light brown color.
- Then they are ready to serve with your favorite type of burger and enjoy!
Recipe Notes
These are best served fresh but you can also refrigerate them for up to 5 days.
You can also top the onions with a burger press to speed up the cooking process as well and the onions will brown quicker.
Nutrition Facts
More Easy Grilling Recipes
Learning how to fry onions on the Blackstone is one of those simple skills that makes a big difference. In just a few minutes, you can turn basic sliced onions into a sweet, flavorful topping that takes burgers, sandwiches, and even steak to the next level.
Once you try them this way, you’ll want to add fried onions to everything. If you make them, let us know how you served them — we’re always looking for new ideas to pile on the griddle!
What can you substitute for the avocado oil?
You can use vegetable oil. I don’t recommend olive oil, because it cannot handle the high heat.