Procure forty-two very fresh, soft clams, so that no sand should adhere to them after they are opened; lay them carefully in the palm of the left hand, and with the fingers of the right remove the body gently, but nothing else, being very careful not to break it, and throw away all that remains. When they are all prepared, place them in a stewpan with an ounce of good butter, half a pinch of white pepper, a wine-glassful of good Madeira wine, and two finely hashed, medium-sized truffles. Put on the cover, and let cook gently for eight minutes. Break three egg yolks into a bowl, add a pint of sweet cream; beat well for three minutes, then pour it over the clams; turn well the handle of the saucepan for two or three minutes, very gently shuffling the clams, but it must not boil again or the clams will break, and be very careful not to use either a spoon or fork. Pour them into a hot tureen, and send to the table at once.