Fill the base of your steamer with water and bring to the boil.
Drain the tofu and place it on a heatproof plate that will fit inside the steamer. Steam the tofu for 20 minutes, then drain off excess water and carefully transfer to a serving plate.
Finely slice the red chilli. Trim and finely slice the spring onions.
Heat the soy sauce, sesame oil and oyster sauce togeth