In a medium sauce pan combine the sugar, water and corn syrup over medium heat. Swirl around in the pan until the sugar is melted.
Continue cooking until it's golden brown. About 8-10 minutes.
Turn off the heat and add the butter, sea salt and heavy cream. Mixture will bubble up. Whisk until smooth. Transfer to a sealed container and refrigerate.
Recipe by Friday is Cake Night at https://www.fridaycakenight.com/2014/06/salted-caramel-sauce/