Roughly chop all your veg into equal chunk and place in a bowl with the cleaned prawns and cherry tomatoes.
Meanwhile, roughly chop your coriander and place in a food processor.
Trim the lemongrass, take the hard outer leaves of and lightly bash. Roughly chop and add to the processor with the soy sauce and rice vinegar. Loosen with a little water if needed.
When in a coarse paste, marinade the kebab ingredients and either leave overnight for a fuller flavour, or cook immediately if prefered.