Coffee Cream Sauce

Pour 2 cups boiling hot cream over 2 tablespoonfuls freshly ground coffee; cover tightly and let it stand 10 minutes; then strain the cream through a fine sieve; put the cream in a small saucepan; add the yolks of 2 eggs, 1 teaspoonful cornstarch and 2 tablespoonfuls sugar; put this over a moderate fire and stir until it comes to a boil; remove from the stove, pour it into a sauce bowl and stir the beaten whites of the eggs through it; serve cold.