Make the most perfect grilled onions every single time with my amazing grilled onion hack! The perfect addition to so many meals!

Onions Grilled to Perfection, Every Single Time!

It still blows my mind that onions, such a strong-tasting vegetable, can cook down into something so sweet and caramelized. The flavor is completely transformed and you end up with tender, delicious onions! They are so versatile, delicious, and go with just about everything!

I love grilled onions for burgers, pizzas, sandwiches, breakfast, and even on my salads, but they have to be cooked just right. The first few times I made them it was a complete disaster. As in, the smoke detector went off and I was left with a pan full of charred remnants of what used to be an onion.

So to help you avoid the same mistakes, here is exactly how I make onions, grilled perfectly in my cast iron pan, every single time!

ingredients to make grilled onions

How to Make Grilled Onions

All you need are four ingredients to make these caramelized onions: onion, salt, and butter… and my absolutely amazing hack: water. I know it sounds weird, but trust me, it’s the best hack!

Simply slice your onions like the photo below (about 3/8″ thick), warm up your skillet over medium heat, add the butter, onions, and kosher salt, and cook, stirring every few minutes.

step by step instructions on how to make the perfect caramelized onions

My Amazing Grilled Onion Hack

WATER! As soon as the onions start to look a little dry, add in a few tablespoons of water. This will prevent the onions from drying out and keep them juicy and cooking at an even temperature. The water will evaporate as it cooks, leaving you with perfectly juicy onions, grilled to absolute perfection. 

pouring water into the pan while sauteeing onions

Which Onions Are Best for Grilling?

This recipe will work with yellow onions, white onions, red onions, sweet onions, etc! Basically, whatever flavor profile you’re looking for, choose that onion and grill it!

Red Onion: great for steak, burgers, sandwiches, and salads!

Yellow Onion: milder in flavor, great with burgers, stir fry, fajitas, casseroles, and other Mexican-inspired dishes.

Sweet Onion: a mild flavor with a hint of sweetness, great with pizza, pasta, and sauces.

Ways to Serve Grilled Onions

Grilled onions are great for:

burgers

salads

sandwiches

casseroles

fajitas

stir-fry

sauces

pizza

steak dishes

pasta

tacos

Pro Tips

Dairy Free/Vegan: If you need these to be dairy free, you can use coconut oil in place of butter or ghee.

Storing: Leftovers will keep in an airtight container refrigerated for at least 5 days, or frozen for at least 6 months. You can enjoy cold out of the fridge, or rewarm in the microwave or skillet.

Common Reader Questions

Is grilling onions keto-friendly?

Yes! Onions are super low in carbs and make for a great, flavorful addition to any keto-friendly meal. Grilling them with butter only makes the fat content higher, helping you reach your daily macros!

Can I freeze grilled onions?

Yes! They can be frozen for at least 6 months. You can enjoy them thawed and cold out of the fridge, or reheat in the microwave or skillet.

Are these grilled onions Whole30 compliant?

Use ghee or coconut oil to grill these onions with Whole30 friendly ingredients.

Perfect Grilled Onions Hack!

Make the most perfect grilled onions every single time with my amazing grilled onion hack! The perfect addition to so many meals!
5 from 4 ratings
Prep Time 5 mins
Cook Time 30 mins
Total Time 35 mins
Course Side Dish
Cuisine American
Servings 2 people
Calories 236

Ingredients
 
 

  • 1 large yellow onion sliced
  • 2 tablespoons butter or ghee
  • 1 teaspoon kosher salt
  • water

Instructions
 

  • Heat your cast iron skillet over medium heat.
  • Add the butter, onions and kosher salt. Cook stirring every few minutes.
    1 large yellow onion, 2 tablespoons butter or ghee, 1 teaspoon kosher salt
  • As soon as the onions start to look a little dry, add in a few tablespoons of water. This will both prevent the onions from drying out and keep them juicy and cooking at an even temperature. The water will evaporate as it cooks, leaving you with perfectly juicy onions. I usually add water twice during the cooking process.
  • Continue to cook the onions uncovered until they are soft and golden brown. About 30 minutes.
  • Serve warm or cold.
  • See the Recipe Notes below for more tips, FAQ's and recipe substitutions.

Recipe Notes

Onion: You can also use white or red onion.
Dairy Free/Vegan: If you need these to be dairy free, you can use coconut oil in place of butter or ghee. 
Whole30: Use ghee or coconut oil to keep these Whole30 friendly.
Storing: Leftovers will keep in an airtight container refrigerated for at least 5 days, or frozen for at least 6 months. You can enjoy cold out of the fridge, or rewarm in the microwave or in the skillet.

Nutrition

Calories: 236Total Carbs: 7.5gProtein: 1.1gFat: 23.1gFiber: 1.4gNet Carbs: 6g

Nutrition facts are calculated as a courtesy and not guaranteed.

Author: Natalie Gruendl from www.tasteslovely.com
Keyword easy, grilled onions, how to
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