You need a blender, I always do it with a hand blender, but I’ve seen a regular blender work too.
In a receptacle you add
- 1 egg
- 1 tsp dijon mustard
- any form of vinegar (you can also use pickle juice)
- (optional) 5-6 small capers with juice
- some lemon juice
- salt and pepper
Blend it all together. It can happen that while blending the parts don’t mix together. Take them out, clean everything and start over.
After mixing this, slowly add 250 ml of neutral oil (vegetable/canola/…) while still blending.
You can add more of anything to taste.
On burgers or with fries, or on a sandwich, with a ham and cheese toast, as a basis for other sauces, not so much in cooked dishes. But I suppose if you can get the taste without so much oil you’re better off doing what you’re doing 😅