Incredible Charred Grilled Onions on a Foreman Grill Recipe (2024)

Grilled Onions on a Foreman Grill Recipe

4 - 30 vote[s]

Grilled onions are one of the easiest vegetables to prepare, and the flavors are incredible. There is something about a charred onion that makes any dish taste better. When you grill onions on a George Foreman Grill they become soft and sweet.

Did you know that onions have natural sugars in them? They are also high in water content. The natural sugars help the onions to caramelize when grilled. The water keeps them moist.

Onions are free of fat, cholesterol, and sodium. They are a high fiber food and provide a decent amount of vitamin C and manganese. At a mere 45 calories per serving, onions add abundant flavor to a wide variety of dishes, especially for those of us watching our waistlines.

Let’s explore a basic grilled onion recipe and what to do with them after grilling.

Grilled Vidalia Onions

You can use any sweet onion that is available in your local grocery or farmer’s market. Sweet onions tend to be somewhat elliptical in shape with more surface area than rounder onions when sliced. And, they are inherently sweeter than yellow, white, or red onions, making them perfect for caramelizing on the grill. Onions don’t need any seasoning when grilling, just a little oil.


  • 1 large Vidalia onion (or similar sweet onion)
  • Extra virgin olive oil (EVOO)

Total time:15 minPrep time:5 min – Cook time:10 min – Serves:2 people
Author: Jason


1. Heat your Foreman Grill to high for approximately 5 minutes.

2. Slice the root end of the onion off. Peel back the skin to the stem end to reveal the white flesh. Slice the onion into 1/4 to 1/2 inch solid rounds.

3. Coat both sides of the onions generously with EVOO.

4. Place the rounds on the grill and close the top. Cook for 5 minutes. Then, carefully flip the onions with a spatula so that they remain intact. Grill for an additional 5 to 7 minutes. The flat surfaces will char and get black grill marks, and the centers will be soft but not mushy.

5. Remove the onions to a cutting board and either serve whole or in rings. If adding to another dish, chop the onions to the desired size for the recipe.

I like onions just the way they are with a sprinkling of sea salt and some freshly ground pepper. I also like to add grilled onions to other dishes because of the sweet smoky flavor they add. A great use of grilled onions is in an upscale grilled cheese sandwich. Onions and cheese go well together, in my opinion. While your grill is still hot, try this grilled cheese recipe.

Grilled Cheese with Grilled Onions and Prosciutto

I happen to like this sandwich with cheddar cheese, but Emmental works really well too. I also prefer whole grain bread for the nuttiness and health benefits. Gluten free whole grain bread works fine. If you like white bread, that is really okay too. The prosciutto adds a nice salty element.


  • 4 slices of whole grain bread
  • 1-1/2 TBS butter (more or less) at room temperature
  • 4 slices of cheddar cheese
  • 1 grilled onion, chopped
  • 4 thin slices of prosciutto


1. Heat you Foreman Grill. If it has the option, heat it to medium.

2. Butter both sides of the 4 bread slices.

3. Place a slice of cheese on 2 of the slices of bread. Add 2 slices of prosciutto on top of the cheese. Top that with the chopped onion. Add another slice of cheese and top of the onions. Place a slice of bread on top of each assembled sandwich.

4. Grill with the top closed for 3 minutes until the bread is golden brown and the cheese is starting to melt.

While I did this on a basic grill, you could use the Foreman Panini Grill.

Suggestions from Foodie Friends

I tried this sandwich on the 4th of July because I had leftover grilled onions from a fireworks party I hosted the night before. The onions were a huge hit served with other roasted and grilled vegetables. Some of my guests were skeptical about onions on a grilled cheese sandwich when I mentioned it. They had a few suggestions that would elevate this sandwich.

The first suggestion was to make it a little sweeter by adding a smear of fig jam. That sounded pretty good. Here is a simple fig jam recipe from 52 Kitchen Adventures. Or, you could just buy a good jar of your favorite preserves.

The second idea was to serve the sandwich with a tomato or fruit chutney on the side that you could just dip the sandwich into with each bite. Jamie Oliver has a really simple tomato chutney recipe. Tomatoes, onions, and cheese are a terrific trio.

On that train of thought, this sandwich would pair nicely with a steaming bowl of creamy tomato soup and a good beer or stout. That sounds perfect for a fall afternoon. Remember, with the Foreman Grill you can have grilled onions any time of year. Sweet onions peak in the summer, but they will keep for a few weeks if stored properly.

Incredible Charred Grilled Onions on a Foreman Grill Recipe (2024)


What is the best seasoning for onions? ›

Thyme. Thyme is an amazing herb for onion dishes. It packs a big punch for such a tiny leaf, easily holding its own with the stronger flavor of even wild onions like in thyme onion and Roquefort tarts. Or, use thyme to bring depth to a simple onion quiche, or onion-flavored bread.

What are the best onions for grilling? ›

When it comes to grilling, red onions are our first choice. Cut into wedges, they char nicely on the grill, and their interior texture goes jammy, instead of mushy, like white and yellow onions tend to do.

Is it better to caramelize onions with butter or oil? ›

You can use either oil or butter to caramelize onions — but ideally, you use a combination of both! I like to use olive oil, and this cooking fat tolerates heat particularly well. Meanwhile, butter adds a distinctly rich flavor to the caramelized onions.

What is the secret to caramelize onions? ›

How to Caramelize Onions Fast
  1. Add sugar: some cooks swear by adding a pinch of sugar to enhance the onions' sugar content and help them caramelize faster.
  2. Add baking soda: dissolve a 1/8 teaspoon baking soda in 1 tablespoon of water and add the mixture to the onions toward the end of cooking (about 15 to 20 minutes in).
Mar 2, 2022

How can I make my onions more flavorful? ›

How you treat them changes their flavor:
  1. Macerate them in vinegar and they become acidic yet sweet.
  2. Lightly cook them in a pan without browning them for about 10 minutes and they're subtle and savory.
  3. Sweat them like this even longer and their flavor gets more complex and concentrated.
Jun 6, 2021

What brings out the Flavour of onions? ›

So, what is going on? Onions have a unique chemistry with molecules that contain a whole lot of sulphuric compounds. Sulphur is responsible for those pesky tears that pop up anytime you chop an onion, but it is also responsible for flavor and odor. The scientific name for this group of compounds is thiosulfinates.

What's the difference between caramelized onions and grilled onions? ›

Caramelized onions are not synonymous with grilled onions. Both have their place and grilled onions can be delicious, but grilling is about high heat and caramelization happens slowly over low heat.

Why do Mexicans use onion on grill? ›

so ali why do you use this onion on the grill. in Spanish it's called a la seroyami de che. because what it does is it cleans. and the smell of the onion is milsala and delicious.

Which onion has the most flavor when cooked? ›

White onions are probably the strongest-tasting onion on this list. They're typically used in Asian and Mexican dishes, as well as potato and macaroni salads. You can also sauté them, making them ideal for French onion soup or any other food in which you want to add sweet or sour flavor.

What temperature do you sauté onions on a griddle? ›

Around 320°F, sliced onions will caramelize without burning, and don't require constant stirring.

How do restaurants make caramelized onions so fast? ›

The key to achieving perfectly caramelized onions is to use a large saucepan. The wide base gives your onions plenty of room to cook so the water released as they soften can evaporate. This prevents the onions from steaming rather than caramelizing and speeds up the cooking process.

At what heat do you caramelize onions? ›

Caramelization is a chemical change that makes carbohydrates (e.g. sugars) turn brown when heated to temperatures of 310 F or higher. The best onions for caramelizing are the so-called "sweet" onion varieties: Vidalia (Georgia)

Do you use high or low heat for caramelized onions? ›

For most of the cooking process, the heat should be low or medium-low to prevent the onions from burning before they have a chance to soften and caramelize.

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