Use those boiled pink seaside-type prawns in the shell here - they’re cold-water goers and are sweet and juicy. Avoid the frozen peeled ones. Small tigers are fine too.
Pop the squid tubes in a pan of boiling water and cook for about 1 minute, until cooked, then drain and leave to cool. Deshell the prawns and mix with the squid. Pound together the garlic, hot chillies, shrimp paste, 1tbsp of the shallots and half the lemongrass with