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| It's cream that's been treated with a souring agent, like lemon juice, which thickens it and gives it a really sharp taste, certainly not suitable for cakes, even if you sweeten it. | |
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No, it is creme that is slightly fermented, like yogurt.
I often make it myself, starting with fresh cream to which is added a starter (i.e. some creme fraiche or buttermilk), then let it sit out for a day or so, then refrigerate.
Tom