Combine juices and sugar in a ceramic dish. Add whole piece of salmon. Cover and refrigerate for 30 minutes.
Meanwhile, to make guacamole; scoop avocado flesh into a bowl. Add garlic, juice, coriander and Tabasco and mash with a fork.
To make pickled cucumbers; cut cucumbers into quarters lengthways, remove seeds. Cut in half then into thin strips. Combine vinegar, water and sugar in a bowl and stir until sugar dissolves. Stir in cucumber and set aside.
Drain salmon and discard liquid. Cut salmon into thin slices. Arrange salmon, guacamole, pickled cucumber, corn chips, coriander sprigs, red onion slices and jalapeños on a plate or board for guests to assemble.