Every June I’m on pins and needles, anticipating the kick off of the East Coast’s all-too-brief cherry season. As soon as those ruby globes hit the farmers’ markets, I’m stuffing canvas bags with as many sour cherries as I can carry. What’s the allure to sour cherries? Softer and smaller than the sweet varieties, they are a highly versatile, colorful and flavorful fruit. Toss them into a saucepan with a smidgen of sugar and simmer them over low heat and I end up with the foundation for an array of amazing treats. Think I exaggerate? Think again. These guys star in, among other things, pies, tarts, preserves, sauces, meat dishes, drinks and colds soups. Out of the 1,200 varieties of cultivated cherries, 300 are classified as sour. Within the sour family exist the aptly named Early Richmond, which is the first cherry to appear in spring, the juicy, white-fleshed Montmorency and red-fleshed Morello. Chances are that if you’ve ever drunk the liqueur Kirsch or the cocktail guignolo, then you’ve had Morellos; they form the base …