This is a very classic recipe for cheesecake, which is often served in Shavuot holiday dinner.   Makes enough for a 28cm (11") pan or two 20cm (8") pans (not a spring-form).   750ml fromage blanc (or any other soft, smooth, white and not too acidic fresh cheese, such as quarck or even ricotta) - 5% to 8% fat (not more, otherwise it will be to heavy) 200ml sour cream (reduced fat is accaptable) 6 eggs (size L) 220g sugar (about one full cup) 90g co