When you use your AMEX credit card, they make you pay the tip by cash so that the owners doesn't have to pay AMEX the fee. Not legal to force a customer to pay the tip in cash and not put it on your credit card.
The Cuban sandwich was not the traditional sandwich. It was skimpy and the pork was not of a pernil style. When I ordered the plantains, I only got 4 plantains and for the price, it wasn't worth paying for it.