HEAT 40 ml oil in a wok. Add the sliced onion and the prawns. saute for one minute. Add sambal sauce to the prawns and toss for five minutes or till done. Remove from heat. Serve garnished with sauteed onion, diced red chilli and green chilli. To prepare the sambal sauce: Heat oil in a wok. Add the sambal paste and all the remaining ingredients. Keep stirring for 30 minutes. Add salt and pepper to taste. Remove from heat. When cool, store in an airtight jar in a refrigerator.