In a large bowl, stir beef, juniper berries, parsley, garlic, onion, celery, bay leaf, wine, Beef & Steak Seasoning and Black Peppercorns. Cover and refrigerate to marinate at least 4 hours (preferably overnight).
Remove beef from marinade and place in a bowl. Sprinkle with flour and stir to coat. Strain marinade. Reserve onion, bay leaf and celery.
Working in batches, brush Wok or frying pan with oil and brown meat over medium-high heat. Remove pieces to a bowl as they are done.
When all beef is browned, melt butter in wok or frying pan over medium-high heat. Add sugar and stir often until it is a deep nutty brown. Stir in reserved marinade, onion, bay leaf, celery and beef broth.
Bring to a boil, then add beef, carrots and Sea Salt. Reduce heat to medium-low. Cover and simmer, stirring occasionally, for about 1 1⁄2 hours, until beef is tender. Stir in mushrooms for the last 15-20 minutes of cooking.