In a skillet, melt the butter over medium heat. Add the shallot and cook for 2-3 minutes until softened.
Add the white wine and reduce for 2-3 minutes.
Add the seafood broth or lobster stock and bring to a simmer. Reduce the liquid slightly, which should take about 5 minutes.
Stir in the brandy and cook for another 1-2 minutes.
In a small bowl, whisk together the egg yolks and heavy cream.
Gradually pour the egg yolk mixture into the skillet while stirring constantly, making sure not to scramble the eggs.
Continue to cook over low heat, whisking constantly, until the sauce thickens. Do not let it boil.
Season with salt, pepper, and lemon juice to taste.