Dry off the tofu and cut it into cubes. Put it into a medium bowl and toss with 1 tablespoon sesame oil, 1 tablespoon arrowroot powder, and salt. Lay out in a single layer on a parchment-lined baking sheet. Bake for 20 minutes.
Dice the garlic and Fresno chilis discarding the seeds. Add the remaining sesame oil to a large frying pan and add the garlic, chilis, and ginger paste. Saute on medium for about 5 minutes.
Now add the hoisin sauce, soy sauce, rice vinegar, brown sugar, and Shaoxing wine. Simmer for 5 minutes until the sugar dissolves. Combine the remaining 1 tablespoon of arrowroot powder with the water and stir to remove any lumps. Add this to the frying pan and simmer for 5 minutes so the sauce can thicken.
Add the cooked tofu to the pan and stir well to coat all of the pieces. Top with scallions and sesame seeds if desired.