Step 1

Cube the roast by cutting it into 1-inch square chunks. Place all the cubes in a bowl. Season with 1 teaspoon salt. Season both sides of the beef shank with the remaining 1 teaspoon.

Step 2

Heat a heavy bottom skillet or cast iron pan over high heat. Add 1 tablespoon tallow and sear the shanks, then sear all the cubed roast. Continue working in batches until all the meat cooks. Add more fat as needed. Use tongs to flip the meat and transfer it to the slow cooker once done. Put the beef shank in the crockpot first, then layer the cubed meat on top.

Step 3

Pour broth over the meat.

Step 4

Cover with a lid and cook on LOW for 8-10 hours (up to 12 hours) or HIGH for 4-5 hours (up to 6 hours).