Slice salmon into 4 one-inch pieces on a diagonal. The salmon skin should be facing up to ensure a nice char when cooking.
Pour sake over the salmon and evenly spread with hands. Set aside for 10 minutes.
After 10 minutes, gently pat the salmon down making sure to dry very well.
Generously salt both sides and the skin of the salmon.
Place a sheet of paper towel on the bottom of a glass or tight seal container.
Place the salmon in the container, making sure there is enough space around each piece. If you need to stack the salmon, add another sheet of paper towel in between each stack. Add one last sheet of paper towel on top and close the container lid.
Transfer to the fridge and allow the salmon to cure for at least 1 day and up to 3 days.
When you are ready to cook the salmon, remove from fridge.
Place the salmon sliced (skin side up) on a lined baking tray.
Broil on high for 6-8 minutes or until golden brown, on one side only. The salmon does not need to be flipped.
Remove from the broiler and rest on a wire rack. This is optional however, if you'd like, you can torch the skin for a crispier texture.
Serve with a bowl of fresh rice and your favorite side dishes.