In large mixing bowl, soak bread crumbs in milk for 5 minutes. Add meat, eggs, salt, pepper, cardamom and chopped onions. Mix well and roll into 1 to 1 1/2-inch meatballs. Saute meatballs in 1/4 cup butter approximately 20 minutes. In a separate skillet, saute sliced onions with 1/4 cup butter, sugar, and pepper until caramelized, about 10 to 15 minutes. Remove mixture from both pans and place on separate plates. Deglaze both saute pans with the remaining 1/2 cup butter and beef broth, scraping up the browned bits. Cook over high heat for 1 minute. Place the contents of both saute pans into one large pot and add cream, onions, gravy maker seasoning and spices and bring to a simmer. Make a slurry with cornstarch and water. Whisk the slurry into the mixture to thicken. Add meatballs and simmer approximately 20 to 30 minutes.
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