Spoon this toffee sauce over our Sticky Carrot Puddings.
Melt butter in a medium saucepan over medium heat. Scrape in vanilla seeds, and add bean. Whisk in cream, sugar, and salt. Bring to a boil. Reduce heat to medium-low; simmer, stirring occasionally, until mixture is slightly thickened, about 5 minutes. Discard vanilla bean.