Using either a mortar and pestle, small bowl of a food processor or an electric spice grinder to pound (or whizz) garlic, ginger and chilli to a paste.
Heat the oil in a wok until hot but not smoking and quickly add the spice paste. Briefly stir fry until fragrant and then add the chicken mince. Continue to stir fry until just cooked, adding a little sesame oil if necessary. Shake oyster sauce, water and cornflour in a container until well mixed and add to the just cooked chicken and spice paste mix.
Bring to a simmer, reduce heat and simmer for a few minutes to ensure chicken is cooked and sauce thickened (add more water if sauce is too thick). Add tofu, coriander and spring onions and gently heat through before serving on white or brown rice, cauliflower rice or as is garnished with any of the garnishes mentioned above.