Scale and clean the tench, cut them into pieces, and lay them in a stewpan; add the stock, wine, onions, mushrooms, herbs, and mace, and simmer gently for 1/2 hour. Put into another stewpan all the remaining ingredients but the oysters and lemon-juice, and boil slowly for 10 minutes, when add the strained liquor from the tench, and keep stirring it over the fire until somewhat reduced. Rub it through a sieve, pour it over the tench with the oysters, which must be previously scalded in their own liquor, squeeze in the lemon-juice, and serve. Garnish with croutons.
Time: 3/4 hour.
Seasonable from October to June.