Place your tofu in a steamer or steam basket and steam until fully cooked through, 15-20 minutes.
While your tofu is steaming, you can work on your sago. This would depend on the kind of sago you have — some require almost an hour of cooking while others are done in 5 minutes. I provide more sago cooking tips in the post. Once your sago is done, put it aside in a bowl of cold water until you're ready to assemble.
To make the arnibal, simply combine 1 cup brown sugar with 1 cup water in a saucepan and bring to a boil.
Bring down to a simmer until the sugar dissolves, about 5-7 minutes. Continue to stir so the sugar doesn't stick to the pan. Remove from heat and add 1 tsp vanilla extract. Stir to combine. Set aside until you're ready to assemble.
To make taho, put tofu, sago and syrup in a mug, glass or bowl and enjoy! How much of each you put depends entirely up to you.
The number of servings depend on how you layer/customize your taho.
You can also prepare more sago or arnibal, adjust the quantities depending on how you like to take your taho.