Without ceasing to beat, pour lemon juice into the cream. (freshly squeezed lemon juice, not concentrate) The cream quickly begins to thicken. Continue whipping the cream for a couple more minutes. The whipping time depends on the fat content and density of sour cream, as well as on the power of your equipment. It may take a little more (or less) time for the cream to acquire the desired consistency. If you add more lemon juice, the cream will get even thicker.
The cream is light, gentle, non-greasy. It can be used for sponge cakes, tubes and profiteroles, for cupcakes.