[Make the sauce] Put all the pouring sauce ingredients in a pot.
Bring to a boil, then turn off the heat.
You can also make the pouring sauce by putting all the ingredients for the sauce in a heatproof container, and microwaving it at 600W for a minute and half.
Wrap the firm tofu with a paper towel and let it rest for a while before draining.
Then cut the tofu into your preferred size.
Pour a generous amount of vegetable oil into a frying pan.
Coat the pieces of tofu with katakuriko on all sides, and place in the frying pan.
Make sure the pieces of tofu aren't touching each other.
Flip the pieces over and fry both sides over medium heat (you can fry all sides if you like).
Remove from the heat when the firm tofu gets crispy on the surface, and transfer them to a bowl.
Pour the sauce from Step 1 over the tofu.
Top with drained grated daikon radish and green onions.