Sour cream is cream which has been fermented at room temperature. The cream proteins have been broken down by microbes making it slightly sour (acidic) and full of probiotic bacteria. Sour cream is a great partner for herbs such as chives and wild garlic. This is probably the simplest of ferments to make yourself.
I will add photos as soon as possible. This recipe is super simple so if you would like to try, download the instruction sheet and start fermenting for a far healthier version of cream!