Creamy Avocado Onion Mayonnaise – Easy Homemade Avocado Mayo
If you love creamy sauces but want something fresh and flavorful, this Creamy Avocado Onion Mayonnaise is an easy recipe to make at home. Ripe avocado creates a naturally rich and silky texture, while onion adds a slightly sweet and savory flavor. Fresh lemon juice keeps everything bright, and olive oil helps create a smooth mayonnaise-like consistency.
This homemade avocado mayo is perfect for salads, sandwiches, burgers, wraps, toast, tacos, grilled vegetables, or dipping. Best of all, everything comes together in a blender in just a few minutes.
Creamy Avocado Onion Mayonnaise Recipe
Prep Time: 10 minutes
Total Time: 10 minutes
Yield: About 1 cup
Difficulty: Easy
Ingredients
- 1 large ripe avocado
- 1/4 small onion, roughly chopped
- 2 tablespoons fresh lemon or lime juice
- 3 tablespoons olive oil or avocado oil
- 2 tablespoons water
- 1 teaspoon Dijon mustard
- 1/2 teaspoon sugar or honey
- 1/4 teaspoon salt, or to taste
- 1/4 teaspoon ground black pepper
- 1 small garlic clove, optional
For a thinner sauce, have an additional 1–2 tablespoons of water ready.
How to Make Avocado Onion Mayonnaise
Step 1: Prepare the Avocado
Cut the avocado in half and remove the pit. Scoop the flesh out with a spoon and place it directly into a blender or food processor.
Choose an avocado that is fully ripe and slightly soft when gently pressed. A ripe avocado is essential for achieving a smooth, creamy texture.
Step 2: Prepare the Onion
Peel 1/4 of a small onion and roughly chop it into smaller pieces.
Add the onion to the blender with the avocado.
Raw onion can have a fairly strong flavor, so don’t add too much at first. You can always add more after tasting.
For a milder mayonnaise, use sweet onion or soak the chopped onion in cold water for about 5 minutes, then drain it thoroughly before blending.
Step 3: Add the Lemon Juice
Pour 2 tablespoons of fresh lemon or lime juice into the blender.
The citrus juice adds acidity that balances the richness of the avocado and oil. It also helps slow the browning of the avocado.
Step 4: Add the Mustard
Add 1 teaspoon of Dijon mustard.
Mustard provides the characteristic tangy flavor associated with mayonnaise and complements the avocado and onion.
Regular yellow mustard can be substituted if Dijon isn’t available.
Step 5: Add the Olive Oil
Pour in 3 tablespoons of olive oil or avocado oil.
Avocado oil has a very mild flavor, while olive oil creates a slightly richer and more distinctive taste.
The oil helps make the sauce silky and gives it a richer mouthfeel.
Step 6: Season the Mayonnaise
Add:
- 1/4 teaspoon salt
- 1/4 teaspoon black pepper
- 1/2 teaspoon honey or sugar
If you enjoy garlic, add one small peeled garlic clove as well.
The small amount of honey or sugar is optional, but it helps balance the acidity of the lemon and the sharpness of the raw onion.
Step 7: Add Water
Pour 2 tablespoons of water into the blender.
Don’t add too much liquid at once. The goal is to create a thick mayonnaise-like consistency rather than a watery dressing.
You can always add more water later.
Step 8: Blend Until Creamy
Secure the blender lid and begin blending.
Blend for approximately 30–60 seconds, or until the ingredients are completely incorporated.
At first, you may still see pieces of avocado and onion. Continue blending until the mixture transforms into a thick, pale-green, silky cream.
Stop the blender and scrape down the sides if necessary.
Blend again until there are no visible pieces of onion or avocado.
Step 9: Check the Texture
Scoop up some mayonnaise with a spoon.
For sandwiches, burgers, and toast, the mayonnaise should be thick enough to hold its shape on the spoon.
If you want to use it as a salad dressing, add another tablespoon of water and blend again.
Continue adding water in very small amounts until you reach your preferred consistency.
Step 10: Taste and Adjust
Taste your avocado onion mayonnaise before serving.
Add more lemon juice if you want it brighter and tangier.
Add a little more salt if the flavor is too mild.
Add more black pepper for extra spice.
If the onion flavor isn’t strong enough, add another small piece of onion and blend again.
For additional heat, add a pinch of chili flakes or a small piece of jalapeño.
How to Use Avocado Onion Mayonnaise
This sauce works especially well as a spread or dip. Try it with:
- Chicken sandwiches
- Burgers
- Toast
- Wraps
- Tacos
- Burritos
- Grilled chicken
- Roasted potatoes
- Fresh vegetable sticks
- Salads
- Grain bowls
- French fries
For a quick Avocado Onion Mayo Toast, toast a thick slice of sourdough until crispy. Spread the avocado mayonnaise generously over the surface and finish with black pepper, chili flakes, and chopped herbs.
Turn It Into a Creamy Salad Dressing
This mayonnaise can easily become an avocado salad dressing.
Prepare the recipe normally, then add 2–4 additional tablespoons of water and another teaspoon of lemon juice.
Blend until smooth and pourable.
Drizzle it over a bowl of lettuce, tomatoes, cucumbers, corn, carrots, or other fresh vegetables and toss until everything is lightly coated.
Flavor Variations
Spicy Avocado Onion Mayo: Add a small piece of jalapeño, chili flakes, or a little hot sauce before blending.
Garlic Avocado Mayo: Add 1–2 garlic cloves for a stronger garlic flavor.
Herb Avocado Mayo: Blend in a handful of fresh cilantro or parsley.
Avocado Lime Mayo: Use fresh lime juice instead of lemon. This version is particularly good with tacos and Mexican-inspired dishes.
Creamy Yogurt Avocado Mayo: Add 2 tablespoons of plain Greek yogurt for an even creamier, slightly tangier sauce.
Tips for the Creamiest Avocado Mayo
Use a fully ripe avocado. An underripe avocado will be difficult to blend smoothly.
Cut the onion into smaller pieces before blending so that it incorporates completely into the sauce.
Add liquid gradually. It’s easy to thin the mayonnaise, but difficult to thicken it again after adding too much water.
Blend longer than you think you need to. An additional 15–20 seconds can make a noticeable difference in achieving a smooth, glossy texture.
Fresh lemon or lime juice is especially useful in avocado-based sauces because avocado naturally begins to brown after exposure to air.
How to Store Avocado Onion Mayonnaise
Transfer the finished mayonnaise to a clean, airtight container and refrigerate immediately.
Because avocado oxidizes quickly, this mayonnaise is best enjoyed fresh. For the best color, flavor, and texture, try to use it within 1–2 days.
To help reduce browning, press food-safe wrap directly against the surface before sealing the container.
Some slight darkening can occur naturally as avocado is exposed to oxygen.
Why You’ll Love This Recipe
This Creamy Avocado Onion Mayonnaise combines buttery avocado with savory onion, fresh citrus, mustard, and olive oil to create a thick and flavorful homemade sauce.
There’s no cooking required—simply add everything to a blender, blend until completely creamy, and serve.
Whether you spoon it over a fresh vegetable salad, spread it on toast, add it to a burger, or serve it as a dip, it’s an easy sauce that can add a creamy avocado flavor to many everyday meals.
