Begin by pressing the tofu for at least 30 minutes to remove excess moisture. Once pressed, cut the tofu into 1-inch cubes.
In a shallow dish, add the cornstarch. Gently toss the tofu cubes in the cornstarch until they are well-coated and each cube is evenly dusted.
Heat the vegetable oil in a large non-stick skillet over medium-high heat. Once hot, carefully add the cornstarch-coated tofu in a single layer. Fry for about 3-4 minutes on each side, or until all sides are golden brown and crispy. Remove tofu and place on a paper towel-lined plate to absorb any excess oil.
In a small saucepan, combine the orange juice, soy sauce, maple syrup, grated ginger, minced garlic, rice vinegar, sesame oil, and orange zest. Bring the mixture to a simmer over medium heat and cook for about 3-5 minutes, until the sauce thickens slightly.
Gently toss the crispy tofu in the orange sauce until each piece is well-coated. Allow the tofu to soak up some of the sauce for an additional minute.
Remove from heat and transfer the glazed tofu to a serving dish. Garnish with sliced green onions and sesame seeds for an extra touch.