In a medium-sized saucepan on high heat, combine the sugar and corn syrup.
Cook for 6-8 minutes or until the sugar turns a medium goldish brown, stirring constantly. Then, remove from heat. (I have a tendency to burn sugar. Susan from "she's becoming doughmesstic" reminded me in the instructions that even after removing the sugar from the heat, it will continue to cook. It's best to pull it too early rather than too late. I listened, and this caramel didn't burn. Yippee!)
Cool for one minute.
Add the miso and vanilla and stir rapidly to combine.
Whisk in the sour cream.
Cool to room temperature.
Use however you'd like - drizzled on fruit, on fingers, on ice cream, or on cupcakes!