In a small sauce pan add butter, cook on medium to low heat until melted, then mix water and sugar add to butter, add salt, vanilla, corn syrup and heavy cream, let come to a boil. Simmer for 10 min. Stir slightly one when it is boiling. Remove from heat and let cool. Poor in an airtight container until ready to use. Tip: do not scrap sides of sauce as it will cause sugar to crystalize.