For salted caramel use 1/2 - 1 tsp coarse sea salt. Add salt to desired saltiness.
Instructions
In a heavy pan, mix together sugar, syrup and heavy cream. Cook over medium heat for 5-6 minutes or until it reaches 230 degrees on a candy thermometer.
Stir in butter and vanilla.
Serve warm and refrigerate any leftovers
When reheating do not allow it to boil or it will get grainy and harden when put on ice cream.
Notes
Having a good heavy pan is important. It will help prevent the caramel from burning. Use a light colored stainless steel pan . The light color allows you to see the amber color of the caramel better and know when it's done. Make sure you’re using a light-colored stainless steel pot. Stainless steel also conducts the heat more evenly.
Be sure to stir often. Use a wooden spoon or a heat proof spatula to stir with.
Use a candy thermometer to make sure you have the right temperature. When you reheat the sauce do not let it come to a boil. If it boils too much the sauce will get grainy and harden when you put it on ice cream or anything cold.