Step 1

Place a bowl onto mixing bowl lid and weigh shiitake mushrooms into it. Cover with boiling water and set aside to soak for 20 minutes. Drain mushrooms and set aside.

Step 2

Place lemongrass, coriander, chillies, Kaffir lime leaves, tomato, ginger, garlic, galangal and eschalots into mixing bowl and chop 4 sec/speed 10

Step 3

Scrape down sides of mixing bowl with spatula and chop 4 sec/speed 10.

Step 4

Add stock paste, water, tom yum paste, fish sauce, sugar and drained mushrooms and cook 8 min/100°C/speed 1.

Step 5

Add prawns and cook 3 min/100°C//speed 1.

Step 6

Add lime juice and stir using spatula, then divide between 4 serving bowls. Garnish with shredded spring onion/shallot and extra coriander leaves just before serving.