Chocolate Bourbons

Name: Chocolate Bourbons
Prep time: 1 h
Cook time: 1 h 45 min
Total time: 1 h 45 min
Yield: 25 pieces
Ingredients: 4 oz unsalted butter; 4 oz light brown sugar; 1 oz golden syrup; 6 oz self-rising flour; 2 oz unsweetened cocoa powder; 2 oz corn starch; 1 - 2 oz water; 1 pinch fine sea salt; 2 ½ oz unsalted butter; 5 ½ oz confectioners sugar; 1 oz unsweetened cocoa powder; ½ tsp vanilla extract; 1 tbsp boiling water