Sous Vide Corned Beef (Store-Bought or From Scratch) - A Duck's Oven

Ingredients

• 40 g whole coriander seed
• 40 g peppercorns
• 20 g whole mustard seed
• 40 g dill seed
• 4 g cloves
• 4 g red pepper flakes
• 126 g kosher salt
• 7 g Prague Powder No. 1
• ⅓ cup 65 g brown sugar
• 12 cups 3 liters water, cold
• Half a brisket (4-6 lbs)
• Store-bought raw corned beef (if using store-bought)
• Meat and Potatoes Seasoning
• 4 cups water or beef stock
• 6 red potatoes (cut into large cubes)
• 3 carrots (largely diced)
• 1 head of green cabbage (cut into 3 inch wedges)
• Chopped parsley for garnish