- Crumble the tofu and blend with soymilk, sugar and salt.
- Blend until smooth.
- Pour into mixing bowl, and whisk in water, rum and vanilla.
- Cover and refrigerate.
- To serve, blend half of the mixture in the blender with 10 of the ice cubes until frothy. Repeat with the other half. Serve in glasses with nutmeg sprinkled on top.