Prepare the Brine: Heat half of the water in a pan over medium heat. Add sugar, salt, coriander seeds, mustard seeds, black peppercorns, and pink salt. Stir until dissolved.
Infuse Spices: Add ginger, bay leaves, and smashed garlic. Let it warm without boiling to help the spices infuse.
Cool and Combine: Pour the heated brine into the remaining cold water in a container. Allow to cool completely.
Brine the Beef: Submerge the brisket in the cooled brine. Cover and refrigerate for 7 days.
Prepare for Cooking: After 7 days, remove the beef from the brine, brush off excess spices, and pat dry.
Slow Cook the Beef: Place the brisket in a steam oven at 120°C for 8 hours. If using a home oven, set to 120°C, place brisket on a wire rack, and add a tray of water underneath for steam.