The day before:
1 Pluck the hare.
2 Open the body in half, carefully keeping the liver, heart and blood.
3 Bone the hare flat, being careful not to make holes.
Preparing the marinade:
4 Crush the hare bones, then add your aromatic garnish, dried porcini mushrooms, red wine, Guérande salt, cracked pepper, bouquet garni and let marinate covered for one day plus one night.
Making the stuffing:
5 In a large mixing bowl, thoroughly mix the diced pork fillet, diced pork fat, the mixture of heart and liver ground through a meat grinder, bread crumbs moistened with Burgundy marc, a few truffle peelings, salt, freshly ground pepper, mixed herbs, powdered garlic, then bind with 4 whole eggs. Let macerate in the cold, covered, for a whole day.
Preparing the hare:
6 On your work surface, lay out the boned hare and split the thighs to place part of them on the surface of the ribs.
7 Season with salt and pepper, spread a layer of stuffing then the deveined goose liver cut lengthwise, the truffle cut into large sticks and inserted lengthwise, then a second layer of stuffing.
8 Roll the hare like a sausage (ballotine).
9 On your work surface, lay out a sheet of parchment paper doubled, then oil it and place your ballotine on it.
Cooking the hare royale:
10 Take care of the marinade. Drain the bones on one side, the garnish on the other and the wine separately.
11 In a large heavy sauté pan or large casserole, brown your hare ballotine in a little goose fat on all sides, then add the bones and garnish. Let sweat gently covered for 30 minutes, then add the red wine from the marinade.
12 Cook for about 3 hours 30 minutes at very low simmer. Test it with a larding needle, which should go through easily without resistance.
13 Carefully transfer it to a wire rack, making sure to prick the ballotine with a meat fork all over the surface.
14 Reduce the sauce by one-third.
15 Grind the veins of foie gras through a meat grinder and add the animal's blood, then pour this mixture through a fine-mesh strainer and strain the sauce through it, which will thicken it.
16 Keep the sauce in a bain-marie because it cannot come back to a boil afterwards. Then add your dark chocolate squares, which will give your sauce its roundness and shine.
Serving the hare royale:
17 On a beautiful hot plate, arrange a slice of hare coated with your sauce, two potatoes prepared à l'anglaise, two croutons fried and golden, and around the edge, the sautéed porcini mushroom caps.
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