Prepare the onion: Marinate half a chopped red onion in pickled chili vinegar for 10 minutes, then drain and set aside.
Make the dressing: Mix mayonnaise, mustard, a pressed garlic clove, dried oregano, salt, pepper, olive oil, lemon juice, and a little more vinegar from the pickled chilies. Finally, add a bunch of chopped cilantro.
Combine the salad: Add the marinated onion, slices of pickled chili, and imitation crab to the dressing and mix well.
Add the avocado: Finally, add the avocado, cut into pieces, to prevent it from falling apart and mix gently.
Serve: Serve the salad with salty crackers.