To prevent overcooking and overflowing, your slow cooker should be at least halfway but no more than two-thirds full when you start cooking. Need even more time than a recipe allows? Chilling the crock and ingredients buys 1 to 1 1/2 more hours of cooking time.Don’t peek (too often), every time you open the lid it increases cooking time by about 15 minutes.
2 celery stalks, cut into 3-inch pieces
3 carrots, cut into 3-inch pieces
1 small yellow onion, cut into 1-inch wedges (root end left intact)
1/2 pound small potatoes, halved if large
6 sprigs thyme
1 corned beef brisket (about 3 pounds), plus pickling spice packet or 1 tablespoon pickling spice
1/2 head Savoy cabbage, cut into 1 1/2-inch wedges
Grainy mustard, for serving
In a 5-to-6-quart slow cooker, place celery, carrots, onion, potatoes, and thyme. Place corned beef, fat side up, on top of vegetables and sprinkle with pickling spice; add enough water to almost cover meat (4 to 6 cups). Cover and cook on high until corned beef is tender, 4 1/4 hours (or 8 1/2 hours on low). Arrange cabbage over corned beef, cover, and continue cooking until cabbage is tender, 45 minutes (or 1 1/2 hours on low). Thinly slice corned beef against the grain and serve with vegetables, cooking liquid, and grainy mustard.
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