Lobster Thermidor

Ingredients

• 4 ounces cremini mushrooms
• 1 medium shallot
• 1 large clove garlic
• 4 sprigs fresh parsley
• 1 sprig fresh tarragon (optional)
• 1 small lemon
• 2 ounces Gruyère cheese
• 2 (about 1 pound) whole cooked lobsters, thawed if frozen
• 1/2 cup heavy cream
• 2 large egg yolks
• 1/4 teaspoon kosher salt, plus more as needed
• 2 tablespoons unsalted butter
• 1/4 cup Cognac
• 1 tablespoon all-purpose flour
• 1/2 teaspoon Dijon mustard
• 1/4 teaspoon cayenne pepper

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