01 -
Heat a large 30 cm skillet over medium-high heat. Add oil and swirl to coat. Drain the corned beef brisket, reserving the spice packet if included. Sear the brisket for 2–4 minutes on one side until golden brown, then flip and sear the other side for 2–3 minutes.
02 -
In a measuring jug, combine beef broth and whole grain mustard. Pour the mixture into the skillet, scraping up browned bits over medium-high heat. Transfer the liquid to the slow cooker, pouring over the seared brisket.
03 -
Add smashed garlic cloves, onion wedges, peppercorns, thyme sprigs, and bay leaves to the slow cooker. Sprinkle the reserved spice packet over the contents.
04 -
Cover and cook on low for 6–7 hours, allowing the beef and aromatics to infuse.
05 -
Cut carrots into large pieces. Layer the carrots on top of the brisket, cover, and continue to cook on low for an additional 1–2 hours until nearly tender.
06 -
Slice the cabbage into wedges after removing the stem. In a clean 30 cm skillet, melt butter over medium-high heat. Add cabbage wedges, season with salt, and sauté for about 10 minutes, stirring occasionally, until softened but not fully cooked.
07 -
Transfer sautéed cabbage to the slow cooker on top of the carrots. Cover and continue cooking on low for 30–60 minutes, allowing cabbage to absorb the beef flavors and finish softening.
08 -
While the slow cooker finishes, roast red potatoes in the oven according to your preferred method until golden and crisp.
09 -
Remove the cooked brisket and let rest for 10 minutes. Slice across the grain. Drain cabbage. Arrange corned beef, cabbage, carrots, and roasted potatoes on a serving platter. Garnish with chopped parsley and chives. Serve with horseradish sauce.