Heat the cream gently until small bubbles begin to appear around the edges of the pan. Do not boil. Remove from the heat and set aside.
In a wide pan set over medium heat, melt the butter and sugar together. Once the sugar has completely dissolved, stir in the salt and almond liqueur.
Remove the pan from the heat, carefully pour the warm cream into the pan and gently swirl to combine.
Return the pan to the heat and cook for couple more minutes on low heat, stirring continuously, until the sauce comes to a gentle simmer and is smooth and glossy.
Remove from the heat and allow the caramel sauce to cool for 15 minutes before transferring it to a sterilised jar or airtight container. Store in the fridge for up to three months.