1. Chop the parsley and garlic in a food processor or by hand.
2. Add the remaining ingredients and process until smooth (or chop the vegetables by hand and mix in the ingredients with a whisk or fork).
3. Transfer the mixture to a medium-size saucepan and heat the sauce through over medium-low heat, stirring often.
Don’t allow the sauce to come to a boil or it will lose its texture. (If the sauce comes to a boil, beat in more tofu.)
Béarnaise Sauce à la Brill will keep, tightly covered, in the refrigerator for 5 days.