Place one cup of water in a measuring cup. Microwave until a small boil is achieved. Add in the sugar and salt, then whisk until fully dissolved. Add in the vinegar, whisk again, then place into the refrigerator to cool.
Once cooled, distribute the sauce into small glass bowls and garnish as desired.
To make the tofu, cut the tofu block in half, then cut an X into those squares to produce eight small triangles.
In a medium-sized pot, heat the oil (enough to submerge the triangles in) over medium-high heat. After about 7 minutes, test the oil’s readiness by inserting a wooden spoon into the pot—if bubbles immediately form around the spoon, the oil is ready.
Dip the tofu triangles into the Ener-G mixture, and then coat it in some of the cornstarch, making sure all sides are covered and tapping off any excess. Place the triangles, two at a time, into the oil and fry until golden, about 4 minutes. Carefully remove from the pot and place on paper towels to drain.