Rinse and dry the basil leaves (a salad spinner works well).
Add the salt, honey, mustard, shallot, and basil in a food processor or blender. Pulse several times, to combine.
Scrape the sides of the blender down with a spatula. Add the vinegar and pulse again.
With the blender or processor on low, slowly pour in the olive oil into the bowl or container.
Once all of the olive oil has been blended in, turn off the processor or blender. Scrape the sides down again Add the mayonnaise, cover, and pulse again until the mayonnaise has also been fully incorporated into the dressing.
Notes
Use Fresh Basil: For the best flavor, always use fresh basil leaves. Dried basil is just not going to be the same.
Dry Leaves: make sure the basil leaves are as dry as possible so it won't water down the vinaigrette.
Adjust To Your Taste: Taste the vinaigrette and adjust to your taste. If it doen't need sweetness, leave the honey out completely. If it's acidic add more. Make this dressing your own.
Blend Thoroughly: Ensure that the olive oil is slowly incorporated while blending to achieve a smooth and creamy texture and scrape the sides well. You cannot overblend a vinaigrette.
Consistency: If the vinaigrette is too thin, add more mayonaise. If it's too thick more vinegar or lemon juice.
Make Ahead: chill vinaigrette in the refrigerator for at least 30 minutes before serving. This allows the flavors to meld together.
Storage: Store the vinaigrette in an airtight container in the refrigerator for up to 5 days. Always shake or stir before using, as it may separate if it sits too long.
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