Shell prawns. Reserve shells and heads.
Heat oil in a pan. Roast prawn heads and shells.
Add laksa paste and roast for another minute.
Add in clam stock and bring to a boil.
Transfer to slow cooker and add coconut milk, lemongrass, and fish sauce.
Cook on low for 6 hours.
Adjust cooker to high heat setting.
Add prawns and cook for 15-20 minutes.
Strain out prawn shells.
Blanch egg noodles in boiling water.
Serve broth and prawns over fresh egg noodles.
Top with fresh coriander leaves.
Serve with wedges of lime on the side.