Press tofu for 10 minutes to remove excess moisture.
Heat vegetable oil in a skillet over medium-high heat.
Add tofu cubes and fry until golden and crisp, about 6 minutes.
Remove tofu and set aside.
In the same pan, add sesame oil, garlic, and ginger; stir for 30 seconds.
Toss in broccoli and bell pepper; sauté for 3–4 minutes.
In a bowl, whisk soy sauce, lemon juice, syrup, cornstarch, and water until smooth.
Pour sauce into the pan and cook until slightly thickened.
Add tofu back, toss gently, and coat evenly in the sauce.
Garnish with lemon zest and serve hot over rice or noodles.