<human>: How do you make a good sour cream sauce for potatoes?
<bot>: To make a good sour cream sauce for potatoes, start by combining 1 cup of heavy cream with 2 tablespoons of white wine vinegar and ½ teaspoon of salt in a saucepan over medium-high heat. Bring the mixture to a boil, then reduce the heat to low and simmer until it thickens slightly, about 5 minutes. Finally, stir in 2 tablespoons of butter and season with freshly ground black pepper to taste. Serve warm or cold over your favorite potato dish. Enjoy!