Wipe the squid with kitchen paper towel, then cut it into 1cm thick rings. Leave the tentacles whole (if there are any).
Peel and chop the ginger & garlic. Cut the chilli in half, remove the seeds and vein, then chop the flesh. Slice the spring onion diagonally.
Heat up the oil in a frying pan and cook the chilli, garlic and ginger for half a minute. Add the squid, fry for 1 minute while constantly stirring.
Add the spring onion, sugar and lime juice, a little salt and pepper. Stir-fry for half a minute, scatter the coriander leaves on top and turn off the heat.