Ingredients

* 3 Tbs tomato ketchup
* One-and-a-half Tbs sugar, according to taste
* Quarter tsp salt
* 3 cloves of garlic
* One tsp pounded salted brown soya bean paste
* One cup water
* One-and-a-half tsp cornflour
* Half tsp rice or malt vinegar of freshly squeezed lime juice
* Quarter tsp dark soya sauce

Directions
Mix sauce ingredients except for the vinegar or lime juice. Heat wok, add oil and when hot, add the garlic, stir fry for one minute, add chillies, stir fry for another minute and add crab or lobster pieces.