Ziemowit: The French "fraiche" is "fresh", so it may indicate that the thing hasn't become sour yet, which needs some time and no conservants in it. In other words, it is still "sweet", just as it will be with the Polish term "słodka śmietana". you are wrong here - creme fraiche is actually somewhat soured cream high in fat content (28%) there is an entry on it in English wikipedia - creme fraiche is not widely available in Poland but should be available in at least some shops of the delicatessen sort - eventually one can prepare creme fraiche on his/her own using Polish sour cream and the thick sweet cream (śmietanka 30 to 36% fat) in 1 to 2 proportion - you need to heat and mix both of them but not too much (60 degrees) and them leave for at least 10 hours - I found this recipe on a Polish website
creme fraiche is known not to curdle while heated (contrary to Polish sour cream) - that's why it is widely used in French cuisine as an ingredient in sauces and soups (and in many other recipes)
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