Churros with salted caramel sauce

Name: Churros with salted caramel sauce
Prep time: 30 min
Cook time: 30 min
Total time: 1 h
Cuisine: American, Spanish, Latin American, European, Mediterranean
Ingredients: 45g/1½oz butter; ½ tbsp caster sugar; ½ tsp vanilla extract; 65g/2¼oz plain flour; ¼ tsp sea salt; 1 large free-range egg; vegetable oil, for deep frying; 100g/3½oz granulated sugar; 80ml/2¾fl oz double cream; 1 tbsp unsalted butter; generous pinch sea salt; 40g/1½oz caster sugar; 1 tsp ground cinnamon