Pork

Crack the egg into a bowl and separate the egg white and yolk
Slice the pork tenderloin into strips
Mix salt, starch, soy sauce and the egg white to make the marinade
Marinate the pork strips in the marinade for 20 minutes
Combine remaining starch with water and vinegar to make a starchy sauce
Heat oil in a wok to 375°F and fry the marinated pork strips until browned, then remove to a plate.
Leave some oil in the wok, add tomato puree and sugar and heat until combined
Add water and heat the sweet and sour sauce
Return the fried pork strips to the sauce
Pour in the starchy sauce and stir-fry until the pork and sauce are thoroughly mixed
Serve on a plate and garnish with coriander