Step 1

Place brisket in the crock of a slow cooker. Pour beef stock over brisket.

Step 2

Place pickling spices, garlic, and bay leaves into a cheesecloth bag, tie the bag, and submerge it into the stock.

Step 3

Cook on Low for 8 hours.

Step 4

Remove brisket to a cutting board; cut into small pieces.

Step 5

Strain cooking liquid through a fine-mesh sieve. Discard spices and any strained pieces.

Step 6

Combine brisket, chicken stock, strained beef stock, and cabbage in the slow cooker crock.

Step 7

Cook on Low until cabbage is tender, about 2 1/2 hours.