Tom yam kung

Ingredients for 4 persons:

• 100 g of exotic mushrooms (enokis, mini shiitakes and mini oyster mushrooms)
• 1 stalk of lemongrass, cut into 3 cm pieces
• 50 gr (5 slices) galanga, cut into 2 mm slices
• 3 lime leaves, from which you remove the stalk
• juice of 1 lime
• 2 tbsp fish sauce
• ½ th spoon of sugar
• 1 tbsp chili paste
• pinch of salt
• 1 liter of water
• 8 Gambas (dismantled, head and tail stay on the body)
• a few leaves of (Thai) coriander
• 1 young (Thai) pipe onion cut into rings