Simple, tasty, adorable treat.

Preheat grill to medium-high heat (350° to 400°).

Season prawns and calamari.

Max 2.5 min for the prawns for the each side, 2-2.5 min for the calamari also on each side would do the job (overcooking will make seafood chewy and tasteless).

TIPS:
Alternatively you can BBQ but also need to watch closely not to over cook.