1 cup of sugar
6 Tbsp butter
1/2 cup heavy whipping cream
First, before you begin, make sure you have everything ready to go - the cream and the butter next to the pan, ready to put in. Making caramel is a fast process that cannot wait for hunting around for ingredients. If you don't work fast, the sugar will burn. Safety first - make sure there are no children under foot and you may want to wear oven mitts; the caramelized sugar will be much hotter than boiling water.
Heat sugar on moderately high heat in a heavy-bottomed 2-quart or 3-quart saucepan. As the sugar begins to melt, stir slowly with a whisk or wooden spoon.
As soon as all of the sugar crystals have melted (the liquid sugar should be dark amber in color), immediately add the butter to the pan. Whisk until the butter has melted.
Once the butter has melted, take the pan off the heat. Count to three, then add the cream to the pan and continue to whisk to incorporate. Note than when you add the butter and the cream, the mixture will foam up considerably. This is why you must use a pan that is at least 2-quarts (preferably 3-quarts) big.
Whisk until caramel sauce is smooth. Let cool in the pan for a couple minutes, then pour into a glass mason jar and let sit to cool to room temperature. (Remember to use pot holders when handling the jar filled with hot caramel sauce.) Store in the refrigerator for up to 2 weeks. Warm before serving.