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Roasted Onion Mayonnaise

Rated as 4.76 out of 5 Stars

"Caramelized onions accent the mayonnaise in this delicious sandwich spread."
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1 h 40 m servings 139
Original recipe yields 24 servings (3 cups)


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  1. Preheat oven to 400 degrees F (200 degrees C). Line a baking sheet with aluminum foil and lightly grease.
  2. Place the halved onions onto the baking sheet, and roast in the preheated oven until they have turned deep golden brown, and have softened in the center, about 30 minutes. Remove from the oven and allow to cool to room temperature.
  3. Place the onions into a food processor or blender, add the mayonnaise, and puree until smooth. Season to taste with salt and pepper. Store in the refrigerator.


  • Partner Tip
  • Reynolds® Aluminum foil can be used to keep food moist, cook it evenly, and make clean-up easier.

Nutrition Facts

Per Serving: 139 calories; 14.6 2.3 0.4 7 105 Full nutrition

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Read all reviews 18
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I halved this recipe. I did drizzle a little EVOO over the onions before baking and the mayonnaise I used was reduced fat. I made no other changes. I actually made this the night before last as ...

THIS ROCKS!!!! If I could give it 10 stars, I would. The roasting of the onions brings out the flavor. This was delicious on hamburgers, but our favorite thing is to use it as a french fry di...

This was awesome. I am having burgers tomorrow so I wanted something with alittle zing and this is it. I used about 3/4 cup of mayo and 1 medium onion. Cut the onion into fourths and added 2 ...

We really, really enjoyed this mayonnaise recipe! I read how Roxanne was hoping for more carmalization on her onions, so instead of just cutting them in half I cut them into thick slices and pla...

I found that I could have more control over the caramelization process if I put some EVOO and a pat of butter in a saute pan, sliced my onions into thin rings, and caramelized them that way. I s...

A definite MUST TRY! I made this for homemade Frisco Burgers. I used yellow onion - IMO, it has more onion flavor - chopped in half, then into quarters. Sprinkled with a bit of kosher salt, f...

I love caramelized onions so I had a feeling I would love this mayonnaise. The only problem I had is the fact that my onion didn't get a nice caramel colour all over but it had that wonderful sm...

I used this tonight after viewing this recipe. I blended in my magic bullet, and it came out extraordinary. I used two medium white onions, instead of sweet, and it still have a wonderful flavou...

YUM! Ima mayonnaise fanatic:) LOL I made this to go on some patty melts we had last night and it was fabulous! I also added a few tblsp sour cream to what was left over today and ate it as a dip...