Step 1

In the bowl of your food processor with your "S" blade, add the egg, one tablespoon of the oil, mustard, and lemon juice.

Step 2

Turn the food processor on for one minute to combine the ingredients.

Step 3

With the food processor running, pour the rest of the oil VERY SLOWLY into the bowl. (If you have a "pusher" with a small hole, just pour the oil into the pusher. If not, pour the oil in a few drops at a time until it starts thickening, then you can pour with a thin stream.)

Step 4

The mixture will thicken. When all the oil has been incorporated, turn off the food processor.

Step 5

Add salt, to taste. You can add more lemon juice, or mustard if desired.