- Place cubed tofu between a few sheets of paper towel and gently press to release excess moisture. Transfer to a mixing bowl and sprinkle with cornstarch and black pepper. Stir to coat.
- Heat 2 tablespoons of oil over medium-high heat in a large nonstick skillet until sizzling, about 2 minutes. Working in 1-2 batches, add cubed tofu to hot skillet and cook until crisp, about 8 minutes, turning regularly for even browning.
- Remove tofu from skillet and set aside. Add remaining oil to skillet and stir in bell peppers, eggplant and onion. Stir fry for 5 minutes, stirring regularly.
- Whisk together ingredients for sauce until cornstarch is dissolved. Return tofu to skillet and stir in jalapeños and sauce. Reduce heat to medium low and simmer for 2-3 minutes until sauce has thickened.
- Serve hot over rice garnished with cilantro.