It is a shame that Presidents' Day comes in February, when sour cherries aren't in season. They are the essential fruit for patriotic icon George Washington's equally iconic dessert. I just happen to have some in the freezer leftover from last summer's sour cherry picking frenzy. We have a cherry tree growing in our neighborhood, and my dear friend Linda West Eckhardt and I seem to be the only two people who want to risk life and limb (our limbs, not the trees) by climbing up a shaky ladder to grab the shiny pale red orbs. You will be able to find frozen sour cherries at the supermarket, or certain a big natural food store like Whole Foods. But the key word is "sour." Sweet bing cherries just don't have the correct flavor, color, or texture for sour cherry pie. Here is how to make the VERY BEST sour cherry pie.