Put one half, cut side down, on your hand over a bowl. Use a sturdy wooden spoon to thwack the pomegranate firmly a couple of times, turn the fruit a quarter of a turn and repeat. Be sure you smack every inch of the fruit,repeating until all of the seeds have been released into the bowl. Repeat with the second half. Clean out any little bits of pith that fell into the bowl. Serve immediately or store in an airtight container in the refrigerator for up to 5 days.