Michel Roux served up a tasty super quick herb sauce with egg yolk and mustard on Michel Roux’s Provence Masterclass.
The ingredients include: Chives, dill, basil, parsley, tarragon, celery leaves, tarragon vinegar, pinch of salt, mustard, egg yolk, vegetable oil and water.
See recipes by Michel in his book titled: Michel Roux at Home: Simple and delicious French meals for every day available from Amazon now.