Ingredients
- Two 1 1/2–pound (680 g) lobsters, plus one 1-pound (454 g) lobster (see notes)
- 2 tablespoons (30 ml) vegetable or other neutral oil
- 2 large shallots (about 8 ounces; 225 g total), thinly sliced
- 4 medium cloves garlic, smashed
- 1 celery rib (2 ounces; 60 g), thinly sliced
- Reserved lobster shells, from above
- 1 tablespoon (15 g) tomato paste
- 1/4 cup (60 g) brandy or dry sherry
- 4 cups (1 L) water
- 2 sprigs tarragon
- 2 tablespoons (30 g) unsalted butter
- 1 large shallot (4 ounces; 113 g), finely minced
- 2 tablespoons (16 g) all-purpose flour
- 1/4 teaspoon cayenne pepper
- 1 cup (237 g) Lobster Stock, from above
- 1/2 cup (120 g) heavy cream
- 1 tablespoon (15 g) Dijon mustard
- 2 ounces (60 g) grated or finely diced Gruyère cheese, plus more grated Gruyère for sprinkling
- 1 tablespoon minced fresh tarragon leaves
- Kosher salt and freshly ground black or white pepper
- Grated Parmigiano-Reggiano, for sprinkling
- Lemon wedges, for serving
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