How Do You Thicken Mayonnaise?
Mayonnaise can be thickened by adding more oil or egg yolks. Alternatively, you can try adding a small amount of cornstarch or flour to thicken it. It’s important to add these thickeners gradually and mix well to avoid lumps. Another method is to add a bit of vinegar or lemon juice to the mayo, which will cause it to thicken slightly as it emulsifies.