Lobster Thermidor

Ingredients

• 4 whole lobster tails
• 1 cup olive oil
• ½ cup unsalted butter
• ¼ cup yellow onion, finely diced
• 1 tablespoon garlic, minced
• ½ cup all-purpose flour
• ⅔ cup lobster stock
• 1 ¼ cup heavy cream
• 1 teaspoon kosher salt
• ½ teaspoon black pepper, freshly ground
• ¼ teaspoon nutmeg
• 1 ½ cup dry white wine
• ½ cup brandy or cognac
• 1 ¼ cup lobster stock
• 2 shallot, finely minced
• 2 tablespoons tarragon, fresh, chopped, plus additional for garnish
• 1 cup heavy cream
• 3 large egg yolks
• 1 ½ teaspoon dijon mustard
• ½ cup gruyere cheese, finely shredded
• Kosher salt to taste
• Paprika for garnish