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Roasted Onion Mayonnaise

Roasted Onion Mayonnaise

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Caramelized onions accent the mayonnaise in this delicious sandwich spread.

Ingredients {{adjustedServings}} servings

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Original recipe yields 24 servings



Amount per serving ({{servings}} total)

  • Calories:
  • 139 kcal
  • 7%
  • Fat:
  • 14.6 g
  • 22%
  • Carbs:
  • 2.3g
  • < 1%
  • Protein:
  • 0.4 g
  • < 1%
  • Cholesterol:
  • 7 mg
  • 2%
  • Sodium:
  • 121 mg
  • 5%

Based on a 2,000 calorie diet


  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.
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Sarah Jo

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. I used this in a BLT Sandwich Wrap for dinner last night and let me tell you, it made the wrap incredible. I don't know why I haven't heard of this before but you bet that I'll make this frequently. This would be a wonderful addition to homemade ranch dressing or Secret Sauce. What a killer idea!


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!

Diane Boggs Colbert

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 blender do the rest....AWESOME