How to Make in N Out Grilled Onions

How to Make In-N-Out Grilled Onions: A Flavorful Addition to Your Burger

In-N-Out is a beloved fast-food chain known for its classic and delicious burgers. One of the key elements that sets their burgers apart is the grilled onions. These caramelized onions add a sweet and savory flavor that perfectly complements the juicy patty. If you’re a fan of In-N-Out and want to recreate their iconic grilled onions at home, we’ve got you covered. In this article, we will guide you through the process of making In-N-Out grilled onions, step by step.

– 2 large yellow onions
– 2 tablespoons vegetable oil
– Salt to taste


Step 1: Prep the onions
Peel the onions and cut them into thin slices. You can either use a sharp knife or a mandoline slicer for this step. For best results, ensure that the slices are consistent in thickness to ensure even cooking.

Step 2: Heat the oil
In a large skillet, heat the vegetable oil over medium heat. You want the oil to be hot enough to cook the onions but not too hot that they burn quickly.

Step 3: Add the onions
Carefully add the sliced onions to the hot oil. Make sure they are spread evenly across the skillet to ensure they cook uniformly. Sprinkle a pinch of salt over the onions to enhance their flavor.

Step 4: Cook the onions
Allow the onions to cook undisturbed for about 10 minutes. This will allow them to caramelize and develop a rich golden-brown color. After 10 minutes, gently stir the onions to ensure they cook evenly.

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Step 5: Continue cooking
Continue cooking the onions, stirring occasionally, for another 10-15 minutes or until they reach your desired level of caramelization. The longer you cook them, the sweeter and more flavorful they will become. Adjust the heat if necessary to prevent them from burning.

Step 6: Remove from heat
Once the onions are caramelized to your liking, remove the skillet from the heat and let them cool slightly before using them in your burger. The grilled onions are now ready to be enjoyed!


1. Can I use red onions instead?
Yes, you can use red onions if you prefer. Just keep in mind that they have a slightly different flavor profile compared to yellow onions, so the end result may vary slightly.

2. Can I make the grilled onions in advance?
Absolutely! You can make a larger batch of grilled onions and store them in an airtight container in the refrigerator for up to a week. They can be reheated in a skillet or microwave when needed.

3. Can I use olive oil instead of vegetable oil?
While vegetable oil is the traditional choice for cooking grilled onions, you can use olive oil as a substitute if desired. Keep in mind that olive oil has a stronger flavor, which may slightly alter the taste.

4. Can I add spices or herbs to the onions for extra flavor?
Certainly! If you want to experiment with flavors, you can add a pinch of your favorite herbs or spices to the onions while they cook. Some popular options include thyme, rosemary, or garlic powder.

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5. Can I use frozen pre-sliced onions?
While fresh onions are recommended for optimal flavor and texture, you can use frozen pre-sliced onions in a pinch. Just make sure to thaw them first and pat them dry before cooking.

6. Can I make the grilled onions on a grill instead of a skillet?
Yes, you can make them on a grill by using a grilling basket or aluminum foil. Place the onions in the basket or on the foil, drizzle with oil, and cook over medium heat until caramelized.

7. Can I use sweet onions instead of yellow onions?
Sweet onions like Vidalia or Walla Walla can be used as a substitute for yellow onions. They have a milder flavor and will add a slightly sweeter taste to the grilled onions.

8. Can I freeze the grilled onions for later use?
Yes, you can freeze the grilled onions. Allow them to cool completely, then transfer them to a freezer-safe container or bag. They can be stored in the freezer for up to three months.

9. Can I use a different type of oil?
Yes, you can use other neutral oils like canola or sunflower oil instead of vegetable oil. The choice of oil won’t significantly affect the taste of the grilled onions.

10. Can I use a non-stick skillet?
A non-stick skillet can be used for cooking the onions, but keep in mind that the caramelization process may be slower compared to a regular skillet.

11. How do I reheat the grilled onions?
To reheat the grilled onions, simply place them in a skillet over medium heat or microwave them until heated through. You may need to add a little oil or water to prevent them from drying out.

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12. Can I add sugar to speed up the caramelization process?
While it is possible to add sugar to the onions to speed up caramelization, it is not necessary. Cooking them slowly over medium heat will allow the natural sugars in the onions to develop, resulting in a delicious flavor.

Now that you know the secret to making In-N-Out-style grilled onions, you can elevate your homemade burgers to a whole new level. Enjoy the sweet and savory goodness of these caramelized onions and savor the taste of your favorite fast-food burger right in your own kitchen.