Rehydrate the mushrooms in warm water for 30 minutes. Drain and reserve the soaking water. Roughly chop the mushrooms and sauté them with the shallots and garlic in a pan with a little butter. Add the cognac and flambé. Set aside.
Pass the pork and liver (if using) through a mincer with a medium grate.
Mix the meat with the mushrooms, cream, eggs, thyme, spices, salt, and pepper. Add a little of the mushroom soaking water for extra flavor.
Pour the mixture into a bowl, pack well, and cover with a bay leaf.
Cook in a bain-marie at 150°C for 2.5 hours.
Let cool completely, then refrigerate for 24 hours before serving.
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