Preheat the oven to 425 degrees F (220 degrees C).

Combine garlic, salt, pepper, oregano, and olive oil in a food processor or blender.

Process until smooth to create a garlic paste.

Make several incisions in the pork roast.

Insert the garlic paste into each incision using a spoon.

Place the pork roast in a roaster and cover it.

Bake in the preheated oven for 1 1/2 hours.

Check the internal temperature every 15 minutes.

Continue baking until the internal temperature reaches 175 degrees F (80 degrees C).

While the meat is roasting, place the yucca in a large pot of boiling water.

Cook the yucca until it is fork tender.

Drain the cooked yucca.

Serve the yucca with the Puerto Rican pork roast.