Heat lard in a large pot over medium high heat.
Add the onions, garlic and beef to the pot and brown the meat. The onions should start to become translucent, about 10 minutes.
Add the red bell pepper, and apple cider vinegar and stir to deglaze the pot.
Add the paprika, crushed caraway seeds, marjoram, chili powder and salt to the pot.
Stir in the bone broth, and add the bay leaves and ground black pepper.
Bring the soup to a boil, then reduce heat to low to simmer for 1 1/2 hours.
Add in the diced sweet potatoes, and cover the pot for 30 minutes. Stir occasionally.
When the meat and sweet potatoes are tender, the soup is ready to serve.