Okay, I know what you are thinking, here he goes again with another difficult-to-locate ingredient. Lebneh (or Lebni, Lebne) cheese is made from Kefir (fermented milk—sort of like yogurt) and is available at well-stocked grocery stores or middle-eastern markets. It is very delicious—like a saltier, firmer sour cream. Smooth and creamy. It is the key ingredient in Alice Medrich’s Lebni Tart, which is another great recipe from her most recent cookbook.