Chocolate Sandwich Cookies with Vanilla Cream

Name: Chocolate Sandwich Cookies with Vanilla Cream
Prep time: 40 min
Cook time: 2 h 10 min
Total time: 2 h 10 min
Yield: 60 pieces
Ingredients: 3 ½ oz black sesame seeds; 6 oz cake flour; 3 oz unsweetened cocoa powder; 1 tsp salt; ½ tsp baking soda; 7 oz dark chocolate; 8 oz unsalted butter; 5 oz sugar; 1 large egg; 1 tsp natural vanilla extract; 10 ½ oz sugar; 3 ½ oz unsalted butter; 1 pinch salt; 1 tbsp whole milk; 1 tsp natural vanilla extract