• 30-40 medium prawn shell + head,
• 4-5 slices of ginger,
• 1-2 table spoon of cooking oil,
• 2 litre of water,
• Salt to season

heat the wok in high heat, throw in the ginger and prawn shell, stir fry till it fragrant and turn red, pour in about 2 litre of water, bring to boil, salt to taste –-

Then sieve it–

*What I do is pour it into a big container, till cool store it in the freezer. After it frozen, take it out and break it into big pieces, take the amount I need whenever I cook soup or steam egg.