Recipe By mistycolleen
Published Apr 2nd
Prep 10m Cook 30m Additional 1h Ready In 1h 40m
Servings 3 cups Calories 139.2

Caramelized onions accent the mayonnaise in this delicious sandwich spread.

Recipe Ingredients

  • 2 sweet onions, peeled, and halved
  • 2 cups mayonnaise
  • salt and pepper to taste

Cooking Directions

  1. 1 Preheat oven to 400 degrees F (200 degrees C). Line a baking sheet with aluminum foil and lightly grease.
  2. 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. 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.

Nutrition Facts

  • Calories 139.2
  • Carbohydrate 2.3 g
  • Cholesterol 7 mg
  • Fat 14.6 g
  • Fiber 0.3 g
  • Protein 0.4 g
  • Saturated Fat 2.2 g
  • Sodium 104.9 mg
  • Sugar 1 g


  1. 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 I wanted it to sit in the fridge for as long as possible before using. This. Is. MONEY. - Read more ...
  2. 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 flavouring to it. Thank you! Such a classic!
  3. 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 with corn chips! Thanks so much for sharing
  4. 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 cloves of garlic...drizzled with EVOO and salt and pepper cooked for about 35 minutes and let my - Read more ...
  5. 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 dipping sauce. Everyone I have served this to loves it. Great stuff. Thank you!
  6. 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 seasoned the onion slices (I used one large onion--the size of a fist) with a light sprinkling - Read more ...
  7. 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 placed them on the cookie sheet with 3 cloves of garlic as well. I brushed on a little evoo and sprinkled - Read more ...
  8. 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 fresh ground black pepper and EVOO. Added a couple of sprinkles of garlic powder at the end so it - Read more ...
  9. 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 smell and was very soft by the time 30 minutes had past. Only the edges seemed to - Read more ...

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