Peel the prawns but leave the tail on. Using a sharp knife, carefully devein them - it can be a bit fiddly and time consuming, but is definitely worth it (you could ask your fishmonger to do this bit for you). Season with salt and freshly ground black pepper.
In a medium-sized bowl, mix together the eggs, flour and water until just combined. Season generously.
In a separate bowl, mix together the panko breadcrumbs and smoked paprika.
One at a time, dip each prawn in the batter, then place in the paprika-panko breadcrumbs, turning to coat (press down to ensure the breadcrumbs stick).
Fill a large deep-saucepan, casserole pan or deep-fat fryer ⅓ full of oil and heat until it reaches 190C. Line a plate or baking tray with kitchen paper.
Slowly lower the prawns into the hot oil and fry for about 2 minutes on each side - or until crispy and golden brown. Once you get the hang of it, you can fry in batches of 3 or 4 at once - don’t do too many or you will overcrowd the pan.
Carefully remove the prawns from the oil using a slotted spoon and place on the kitchen-paper lined plate or baking tray to absorb any excess oil. Repeat with the remaining prawns.
Serve warm sprinkled with freshly snipped chives, a sprinkling of sea salt and sriracha mayonnaise. Enjoy!