lobster tails - 2 (2 tails)
water - watch the video to see (for steaming)
butter - 3 tablespoons (3 tablespoons, melted)
shallot - 1 (1 small, finely minced)
garlic - 1 clove (1 clove, finely minced)
heavy cream - 1/4 cup (1/4 cup)
all-purpose flour - 1.5 tablespoons (1.5 tablespoons)
seafood stock - 2/3 cup (2/3 cup)
Dijon mustard - 1 teaspoon (1 teaspoon)
cayenne pepper - 1/4 teaspoon (1/4 teaspoon)
sweet paprika - 1/2 teaspoon (1/2 teaspoon)
brandy - watch the video to see (a splash)
egg yolk - 1 (1 large)
Gruyère cheese - watch the video to see (grated, to taste)
rock salt - watch the video to see (for presentation)
fresh tarragon - watch the video to see (chopped, for garnish)