Prepare White Wine Sauce: Melt the butter in a saucepan and add the shallots, mushrooms, salt and pepper and cook until soft, 3 to 4 minutes. Increase heat to high, add the wine and reduce by half. Add the clam juice and again reduce by half. Strain sauce into a clean saucepan and add the cream. Bring to a boil and reduce slightly until sauce begins to thicken. Adjust seasoning with salt, pepper, Tabasco pepper sauce and lemon if needed.
Preheat the broiler as hot as possible.
Brush 4 large dinner plates lightly with olive oil. Slice the salmon in very thin escalopes and cover each plate completely with the fish.
Bring 1 1/2 cups of the White Wine Sauce to a boil and add the cucumber, squash, tomato, and chives. Return to a boil and spoon hot sauce over each plate, covering the salmon completely. Place the plates directly under the broiler and cook 2 to 4 minutes or until sauce begins to bubble and fish is just barely cooked. Serve immediately with chervil sprinkled generously over each dish.
c.1997, M.S. Milliken & S. Feniger, all rights reserved