Step 1

Preheat oven to 350F degrees.

Step 2

Rinse brisket and place in a large dutch oven. Top the brisket with the seasoning packet and the brown sugar.

Step 3

Pour the guinness beer around the sides of the brisket then add enough water to the pot that it comes up to the top of the brisket.

Step 4

Place the lid on and bake in the oven for 2.5 hours.

Step 5

Take the dutch oven out of the oven and carefully remove the lid.

Step 6

Submerge cabbage around the brisket then add the potatoes, onions and carrots on top. Sprinkle with a little bit of salt and pepper and place the lid back on.

Step 7

Put the dutch oven back in the oven for 1.5 hours before serving.

Step 8

Rinse and pat dry your corned beef and place it in your slow cooker. Pour the seasoning packet and the brown sugar on top of it.

Step 9

Now Pour the Guinness around the brisket. Depending on the size of your crockpot, you might need 2 Guinness Beers. You'll just want to add a little water so that the liquid comes up to the top of the brisket.

Step 10

Next, seal the lid on the crockpot and turn it on high and cook for 6 hours.

Step 11

After 6 hours is up, take the lid off and add the vegetables with a sprinkle of salt and pepper. Push the vegetables down into the liquid so they're submerged then put the lid back on.

Step 12

Cook for another 2 hours on high heat until the vegetables are tender.

Step 13

After that, remove it from the oven and let it rest with the lid on for at least 30 minutes. Before serving, cut the brisket against the grain and sprinkle with coarse flaky salt.