Boil lobsters in a large pot with water for about 8-10 minutes until bright red.
Remove the lobsters, and let them cool.
Save the cooking water.
Extract the meat from the lobsters, reserving the shells.
Chop the meat into bite-sized pieces.
Keep it in the refrigerator for later.
In a pot, melt butter over medium heat.
Add onion, carrots, and celery.
Cook until softened.
Stir in tomato paste and flour to create a roux.
Add white wine to deglaze the pan.
Mix in fish stock and reserved cooking water.
Place lobster shells back in to add flavor.
Simmer for 20 minutes and strain the broth.
Bring the strained broth back to low heat.
Add cream and lobster meat.
Let it heat through before serving.