Melt 1 Tbsp. Of butter in a small saucepan and cook the onion until wilted. Sprinkle with paprika, flour, and thyme, stirring. Stir in the chicken stock, using a wire whisk, and simmer about 3 minutes. Add the cream and bring to a boil. Add the lemon juice, salt, pepper and Cognac. Strain the sauce through a sieve. Return to the heat and stir in the remaining butter and the sour cream. Bring just to a boil, but do not boil. Yield: 1 1/2 cups.
