Drain the soaked cashews and transfer them to a blender. Add the water and blend until fully smooth, about 1 minute.
Nama Chocolate
Line two 3-inch square pastry cutters or one 3x6-inch rectangle cutter with parchment paper. Another option is to use a small baking dish.
Finely chop the dark chocolate and transfer it to a small mixing bowl.
Heat the cashew cream (only 90g, not the whole batch of cashew cream) over medium heat in a small saucepan. Just before it comes to a boil, pour the hot cashew cream over the chopped dark chocolate and stir until the chocolate is fully melted.
Stir in the liqueur if using, and the vegan butter. Once fully combined, pour the ganache into the lined pastry cutters, or baking dish. Tap the baking dish a few times on the counter to remove air bubbles.
Refrigerate for at least 3 hours or until the ganache has firmed up.
Remove the chocolate from the baking dish. Run a large knife under hot water and pat it dry with a kitchen towel. Repeat this step before every cut. Cut the chocolate into 1-inch squares.
Using a fine sieve mesh, sprinkle cacao powder all over the top of the squares of chocolates. Transfer the chocolates to a plate or box and store them in the refrigerator.
Nama chocolates are best served chilled. It will keep for up to 5 days in the refrigerator.
Notes
You will have leftover cashew cream, use to make more nama chocolate or stir in curries, soups, etc. Cashew cream will keep for up to 4 days in the refrigerator.