Heat the oil and fry the garlic and salt until
lightly browned.
Add the tofu and stir-fry for 2
minutes. Add the prawns, wine or sherry and soy
sauce and stir until the tofu and prawns are well
coated in the flavored oil.
Add most of the chicken
stock, bring to the boil, cover and simmer for 3
minutes.
Mix the corn flour with the remaining stock,
stir it into the pan and simmer, stirring, until the
sauce clears and thickens.