Heat a large skillet over medium heat and add enough avocado oil to coat the bottom of the pan to shallow fry the tofu.
Add the cornstarch to a plate along with a pinch of salt and pepper. Stir.
Working in batches, coat each piece of the tofu in the corn starch, shaking of any excess, then fry each piece in the oil for about 3 minutes per side or until golden and crispy. Remove from the pan when done.
Add the bell pepper and onion to the pan along with a pinch of salt and pepper. Sauté until soft, about 5-10 minutes, then add the garlic and ginger and sauté for another minute.
In a bowl, mix together the ingredients for the sauce.
Pour the sauce into the pan and bring to a simmer, then add the tofu back into the pan and carefully stir.
Allow the sauce to simmer as it thickens for a couple of minutes, stirring frequently to avoid burning, then remove from the heat.