Prepare marinade at least 2 days in advance.
Peel, wash and slice vegetables (carrots, celery, leek and garlic). Peel onions. Pin one with laurel leaf and 1 clove.
Crush juniper berries with thyme.
Bring to a boil marinade ingredients : red wine, red wine vinegar, onions, garlic, carrots, leek, celery, juniper berries, thyme.
Pour on top of the meat and leave to rest in your fridge for 48 hours. Use a recipient made of glass or terracotta.
Remove meat form the marinade and dry using kitchen paper.
Bring marinade to a boil. Sieve to collect juice only.
Melt butter in a large cooking pan (cast iron better)
Brown each meat cube on each face, again and again, until no meat left. This step is very important for the color of the sauce.
Place all the meat in the casserole. Coat meat with flour. (= pour flour little by little while mixing with a wooden spoon) Leave to brown just a little time and pour marinade little by little while mixing. Add rind bouillon. Remove from heat. Add slowly pork blood. Cover and cook on low heat for 2 to 3 hours. Meat should be melting in your mouth.
The cooking time will depend on animal age, older the longer, Ask your butcher.
Do not hesitate to add a bit more rind bouillon if needed. Monitor cooking process every 15 minutes and mix regularly.