Step 1

In a medium saucepan combine the butter, cream and brown sugar over medium heat. Gently swirl the pan until the sugar has dissolved.

Step 2

Once the sugar had dissolved allow to simmer undisturbed for 4-6 minutes.  Remove from the heat and stir in the vanilla and the salt.

Step 3

Transfer to an airtight container and keep in the fridge for up to 8 weeks.