Culinary Notes
Be wary of high heat; unlike crème fraîche, sour cream has a lower fat content and high protein, meaning it will curdle and split if boiled vigorously. Always fold it in at the very end of cooking or remove the pan from the heat first.
To prevent splitting when adding to hot sauces, 'temper' it first by mixing a spoonful of the hot liquid into the cream in a separate bowl to raise its temperature gently before pouring it back into the pot.
It is a baker's secret weapon; the acidity reacts with baking soda to provide a vigorous rise, while the fat content ensures cakes and muffins remain moist and tender for days.
Serve it ice-cold as a garnish to provide a cooling contrast to spicy chilies, paprikas, or hot roasted potatoes.