Mix together jerk seasoning and oil, add to tofu and marinate for at least an hour (preferably overnight).
Heat the frying oil in a wok or suitable skillet. Deep fry the tofu cubes for 3–5 minutes and reserve. Pour out most of the oil and stir-fry the onion and garlic; then begin to add the other vegetables, hardest first. Cook very lightly; then add the tofu and stir in gently until ho