Place the yuca in the pressure cooker and fill it with enough water to cover the yuca. Cook under high pressure for five minutes.
While your yuca is cooking. Cut half an onion into slices and mince three garlic cloves. Coat the bottom of a saute pan with olive oil and heat over medium-high heat. Once hot, add your onions and garlic and sautee for about four minutes. (You want to get the onions nice and soft, without overcooking them so that they retain their crunch.)
Once the yuca is done cooking, remove them from the pot. Place on a serving platter and remove the middle tough part with a fork. (You may have to cut some in half lengthwise to do this.)
Sprinkle the garlic powder and salt over them and afterwards, lay out your onion and garlic mojo on top. Serve and enjoy!