1. Set aside 50 g of raw shrimp.
In a saucepan, melt 20 g of butter. Add the seafood and cook for about ten minutes, stirring occasionally. Add 5 minutes of cooking time if the seafood is still frozen.
2. Drain the seafood in a colander to remove excess water (especially with thawed seafood).
3. Melt the remaining butter with the minced shallot. Add the seafood and deglaze with white wine, then add the heavy cream. Season with salt, pepper, and powdered ginger. Set aside.
4. In a saucepan, combine the heavy cream and shrimp. Heat over low heat until the shrimp are cooked (pink). Blend the mixture and strain if necessary.
5. Add the tomato paste and a teaspoon of cornstarch to thicken the sauce. Mix well, then pour over the seafood and mix.
6. Serve in cassolette dishes or shallow plates accompanied by garlic-rubbed bread croutons.