PUMMELO!!

This big, juicy fruit is a pummelo!  It is pictured by a Persian Lime and a Meyers lemon to give an idea of it's size.  It's NEW to me, but not a new fruit.  A little research tells me it's an ancestor of the grapefruit.  It is sweet and doesn't seem a acidic as the grapefruit.  It's really big and made about four generous servings.