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Mustard Sauce for Fish

4 servings

Ingredients

• clarified butter (a generous piece)
• mustard (a few tbsp)
• fish stock (half)
• water (half)
• lemon juice (a little)
• 1 tsp flour
• 1 pcs egg yolk
• raw butter (a piece)

Instructions

1. Whisk together a generous piece of clarified butter, a few tablespoons of mustard, half fish stock, half water, a little lemon juice, and one teaspoon of flour.
2. Bring to a boil, then stir in one egg yolk and a piece of raw butter.

Modernized from a treasured 19th-century German cookbook.