Press the tofu: Wrap each block of tofu in paper towels. Place a plate or pan on top of the wrapped tofu, and put a couple of heavy books on top of that. Let the tofu press for 20-30 minutes.
Preheat the oven to 400 degrees F and lightly grease a large baking sheet with oil or line with parchment paper.
Slice the pressed tofu into cubes, then add them to a large ziplock bag (or large bowl), along with the sesame oil, soy sauce and cornstarch. Close the bag, and shake gently to coat. Arrange the tofu evenly on the prepared pan, and bake for 25 minutes, or until golden and crispy.
While the tofu bakes, make the sauce. In a large pan, sauté the garlic in the vegetable oil for a minute over medium heat. To the pan, add the soy sauce, agave, brown sugar, seasoned rice vinegar and Sriracha hot sauce. Stir and bring to a simmer over medium heat. In a small bowl, mix the cornstarch and water together until smooth, then pour into the pan. Stir constantly until the sauce thickens, then turn off the heat. Stir in the sesame oil.
When the tofu is done baking, add it to the sauce and stir to coat the pieces. Serve with rice, sesame seeds, chopped green onions and some steamed broccoli. Enjoy!