Mix the sherry, tomatoes, soy sauce, honey, ginger and chilli together. Marinate the tofu in it for at least 30 minutes. The longer, the spicier it becomes. Then pour into a sieve and drain well. Catch the marinade and stir in the cornstarch until smooth.
Heat the oil in a wok, fry the cashew nuts and broccoli for 2 minutes while stirring, lightly salt. Add tofu and stir-fry for about 1 minute. Pour some water and cook the vegetables covered for 5 minutes. Stir in the marinade and bring to the boil briefly.