Lobster Omelette Thermidor

I think that this recipe is about as luxurious and indulgent as You can get, I’m using Prosecco, but you can use champagne, white wine or vermouth Absolutely fantastic romantic supper for two, really quick and simple, but utterly delicious, serve with a crispy Caesar salad it’ll definitely take some beating
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For the omelette
4 eggs
100g of lobster meat ( tail, claw or a mix of both)
25g butter
Freshly chopped tarragon
150ml of the Thermidor sauce
For the Thermidor sauce
1 small onion
2 bay leaves
10 whole black peppercorns
100ml of milk
100ml of Prosecco ( plus 50ml for adding to the final sauce/optional)
25g butter
25g plain flour
1 tsp of English mustard
For the Caesar salad
1 crispy cos lettuce
10 anchovy fillets
1 clove garlic
1 tbsp of Dijon mustard
1 egg yolk
1 tbsp of Worcestershire sauce
50g of grated Parmesan