from, Mastering the Art of French Cooking
for veg, salad, and really anything you want if you like Dijon mustard.
2tbl prepared French mustard – for me there is only one. Grey Poupon.
3tbl boiling water
Rinse a small mixing bowl in hot water. Add the mustard and beat with a wire whisk, adding the water by drops.
⅛ to ¼ pt olive oil or salad oil
Again, drop by drop, beat in the olive oil to make a thick, creamy sauce.
Salt and pepper
1 to 2 tbl parsley or chopped fresh green herbs
Beat in salt, pepper, and lemon juice to taste. Then beat in the herbs.