The pith IS bitter. I learned the hard way by cooking with the whole rind, rather than just the zest. Perhaps heat makes the pith bitter, and it is not bitter when it is raw. Or perhaps some varieties of citrus have bitter pith. But I learned my lesson when the meal (long since forgotten) was inediblely bitter due to the pith. Thanks for yielding the sopbox to an opposing point-of-view!

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