Pasta With Yogurt and Caramelized Onions from Kassos

According to Diane Kochilas, author of The Glorious Foods of Greece, from whom I adapted this recipe, you can find this dish, Makarounes Tis Kassou, in many of the Dodecanese Islands. She says it's one of the best and easiest dishes in Greek cooking--I don't know if that's true, but I know this is delicious--sweet onions, tart yogurt, lovely texture. The key is the right yogurt--use Greek yogurt if possible, sheep's milk yogurt is the best, or use plain yogurt that you sit in a sieve and drain until it becomes lovely and thick. The only thing missing from this dish is a bit of color and I have found that adding some fresh Greek oregano or some fresh thyme does wonders both in terms of taste and presentation.