Peel and core fresh pineapple, cut into cubes. Place the pineapple into a large bottle or mason jar with lid. If using vanilla bean, slice the bean from top to bottom in one long slit keeping it attached at the upper stem, like a v-shape. With help of the knife scrape, scrub the seeds and add them into the jar. Fill the jar with vodka. Cover and put it off to the side for 5 days in a fresh and dark place, to let the flavors infuse.