Slice the top and bottom off a pomegranate and score the skin from top to bottom around the pomegranate every few inches, just as you would do to an orange to make it easy to peel.
Dunk the scored pomegranate in a large basin of water and use your fingers to separate the arils (seeds) from the red skin and white membrane that surround the arils. Throw the hard bits of red skin away. Loose portions of white membrane will float to the surface, while the arils will sink to the bottom of the basin.
Use your hands or a small strainer to scoop the white membrane bits off the surface of the water and discard them.
Strain remaining water and arils. Voila! You are left with a whole pomegranate's worth of tasty and nutritious arils.