Lemon meringue cupcakes

Name: Lemon meringue cupcakes
Prep time: 35 min
Cook time: 1 h 30 min
Total time: 1 h 30 min
Yield: 24 portions
Ingredients: 300 g white sugar; 250 g unsalted butter; 1 tsp vanilla bean paste; 250 g buttermilk; 4 eggs; 430 g self-raising flour; 1 tsp baking powder; 1 pinch sea salt; 240 g white sugar; 150 g freshly squeezed lemon juice; 120 g unsalted butter; 3 eggs; 200 g white sugar; 4 egg whites; 1 tsp freshly squeezed lemon juice; 1 - 2 pinches sea salt; ½ vanilla bean