Spanish was not their language, Spanish came from Spain. You think Christopher Columbus landed in Puerto Rico and the natives said hola?
No most of the languages spoken in Puerto Rico and the other islands was Arawakan.
But after a 100 years it was pretty much an extinct language and everyone then spoke Spanish.
Also most taínos were killed or killed themselves because of forced labor and smallpox and measles the Europeans brought with them, the taínos had no defense and were pretty much almost all wiped out.
So fr0m 1493 Spain controlled Puerto Rico and Cuba for almost 500 years, until the Spanish American war of 1898.
But wait… did you know there were people in Puerto Rico before the taínos?
Yes it is believed to be The Ortoiroid people that may have been on the island 2000-4000 years ago then replace by the Saladoid around 250 bc.
As far as foods there are a good majority of foods that have the same names across Latin America but are prepared differently, but everyone seems to have a gusiado, which is like a beef stew and very common across Latin America.
It’s a slow-cooked beef till it almost falls apart in a broth that contains sofrito tomato’s cilantro carrots and potatoes, and beef stock and cooked for 2 hours, and I served it over cilantro lime rice.