4 cups plain yogurt, whole milk or low-fat
2 hothouse cucumbers, unpeeled and seeded
2 tablespoons plus 1 teaspoon kosher salt
1 cup sour cream
2 tablespoons champagne vinegar or white wine vinegar
1/4 cup freshly squeezed lemon juice (2 lemons)
2 tablespoons good olive oil
1 tablespoon minced garlic (2 cloves)
1 tablespoon minced fresh dill
1/4 teaspoon freshly ground pepper
Place the yogurt in a cheesecloth-lined sieve and set it over a bowl. Grate the cucumber and toss it with 2 tablespoons salt; place it in another sieve and set it over another bowl. Place both bowls in the refrigerator for 3 to 4 hours so the yogurt and cucumber can drain.
Transfer the thickened yogurt to a large bowl. Squeeze as much liquid from the cucumbers as you can, and add the cucumbers to the yogurt. Mix in the sour cream, vinegar, lemon juice, olive oil, garlic, dill, 1 teaspoon salt and pepper. You can serve it immediately, but I prefer to allow the tzatziki to sit in the refrigerator for a few hours for the flavors to blend.
Personal Note: Made this for the Sunday afternoon board game party at Mosh and Jolly's. I cheated because I was super short on time though--I just used high quality true Greek yogurt and hoped it'd be dense/thick and flavorful enough without so much time straining. It probably is worth the extra time, and one day I'll try to do it properly all the way through and compare results. But people enjoyed it, even the food snobs at the gathering. So! ...Ina never steers me wrong.