Juicy fish burgers with homemade creamy tartar sauce... Awesome!
If you use frozen fish, let it thaw fully. Then add the fish to a clean blender together with the lime juice, mustard, garlic paste and the egg white. Season with a little pinch of pepper and salt.
Pulse the fish until you get a fine paste. Remove the blade of the blender (or transfer the white fish paste to a large mixing bowl) and add the sliced spring onion.