Der Brucer has no objections to my keeping some tzatziki in the refridgerator. It's a great condiment for his sandwiches (and I'm not talking of peanut butter and jelly kind).
Take a container of plain yogurt (non-fat is fine, just don't get a flavored variety), and dump it into a strainer that has been lined with cheesecloth or paper towels and is sitting above a medium sized bowl. Let as much of the excess liquid drain out as you can. This can take a couple of hours. Just let it sit. Be patient. This means you, BK.
Dump out the whey, and put the strained yogurt into the bowl. Peel and seed a small cucumber, grate it on a box grater, and squeeze out as much water from the gratings as you can. Add that to the yogurt. Chop two to four cloves of garlic with some salt (from a half to a full teaspoon), mashing it up, and add that to the yogurt as well. Finally, add a tablespoon of minced mint (or dill), a couple of grindings of fresh pepper, and a tablespoon of red wine vinegar. mix this all together, pop it into the refridgerator so the flavors can blend, and you've got a great sauce for sandwiches, or to be added to soups, or even make your french fries tastier.