Set your Instant Pot to the saute setting. It will take about 2 minutes for your pot to heat up.
Add oil and onions. saute onions for about 2 minutes.
Add garlic, oregano, orange juice, lime juice, water, and pickle juice.
Add pork chops.
Close and secure lid. Turn the pressure release valve to " sealing" and cook on high pressure for 15 minutes.
Quick Release pressure.
Remove the pork chops from the inner pot. Discard the juices.
Build your sandwich. Place 1 piece of ham, 1 slice of cheese, and 1 Cuban pork chop on a piece of toasted sourdough bread. Garnish with mustard, pickles, and mayonnaise.