Add nam pla, lime juice, egg yolk, flour, garlic, ginger, chili, coriander, spring onions and lime zest; pulse a couple of times until the mix is a fairly rough paste.
Allow the mix to chill for a few minutes.
Shape into balls and roll each ball in flour, then in the beaten egg, then in the breadcrumbs.
Repeat the process for each ball.
Fry in medium-hot oil (the oil should come half way up the sides of the balls) until golded brown on all sides.
Serve on a bed of coriander leaves with a simple dressing of olive oil and lime juice.