Lobster Thermidor Recipe


Sydney Seafood School

by Sydney Seafood School

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An Easy, Simple Lobster Thermidor Recipe for You To Impress

This is a simplified version of the traditional lobster thermidor recipe. If time is short, and you want an easy to cook dinner that will impress then buy a ready-cooked eastern rock lobster and gently warm the meat in the sauce before spooning into the shell. Make classic lobster thermidor at home and  impress all your guests who are so used to lobster mornay recipe. Put a twist on that simple grilled lobster tail recipe, and create a creamy brandy based sauce that will leave your guests wondering how you prepared it.

So browse and buy lobsters today at your online fish market- Manettas Seafood Market.

Recipe supplied by Sydney Seafood School at Sydney Fish Market

Visit for more great seafood recipes and cooking tips, answers to frequently asked seafood questions and the full program of Sydney Seafood School cooking classes.

Serves: 2


  • 1 x 1kg Live Eastern Rock Lobster (see notes)
  • ½ cup fish stock
  • ½ cup dry white wine
  • 75g cold butter, cubed
  • 2 golden shallots, finely chopped
  • 3 tablespoons plain flour
  • ½ cup milk
  • ¼ cup cream
  • 1 teaspoon English mustard
  • Salt flakes and freshly ground white pepper, to taste
  • 1 tablespoon finely chopped chervil or chives
  • 2 teaspoons finely chopped French tarragon or dill
  • ¼ cup (20g) grated gruyere cheese


Step 1

Bring a large saucepan of well-salted water to a rapid boil. Plunge chilled rocklobster into the water (see notes). Cover until it returns to the boil, continue boiling for 13 minutes, then remove and refresh in iced water.

Step 2

Meanwhile, combine fish stock and white wine in a small saucepan and boil until reduced by half. Melt one third of the butter in a separate saucepan, and cook shallots over low heat until soft. Stir in flour and cook for a few minutes until light golden. Add milk and cream and whisk constantly until sauce boils and thickens. Whisk reduced stock, mustard salt and pepper into the white sauce, whisking constantly until sauce boils and thickens. Remove from heat.

Step 3

Split rocklobster in half, clean, remove flesh from shell and cut into large cubes. Set meat and shell aside.

Step 4

Preheat overhead grill to high.

Step 5

Return sauce to a low heat and stir until hot. Whisk remaining butter into sauce, piece by piece, and stir herbs through.

Step 6

Pour a little sauce into the two halves of the rocklobster shell, stir the meat through the remaining sauce and spoon into shells, sprinkle grated cheese over the top and place under grill for 3-4 minutes until golden brown.

Step 7

Serve with a green salad on the side.

The easiest and most humane way to kill any crustacean is to chill them in the freezer for about 45 minutes until they become insensible (but not long enough to freeze them). Once chilled, they should be killed promptly by splitting in half or dropping into rapidly boiling water.
Alternative species: Large live marron (reduce boiling time to 1 minute per 60g average body weight).
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