Sweat the minced shallot and garlic in 20g of butter over low heat until translucent without browning.
Stir in 40g of flour to create a roux, then gradually whisk in 400g of fish stock and 100g of wine.
Simmer the sauce off-center, skimming impurities, then stir in 150g of crème fraîche, 15g of mustard, thyme, and bay leaf.
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