Dark Chocolate and Cardamom Hot Cross Buns with Chocolate Pastry Cream Cross

Ingredients

• 100g sugar
• 120g water
• 1/4 tsp ground cardamom
• 1/2 tsp salt
• 1/2 tsp vanilla bean paste
• 1 tsp salt
• 520g all-purpose flour
• 50g corn starch
• 3 tsp active dry yeast
• 1 tsp cinnamon
• 400g whole milk
• 120g sugar, divided
• 2 1/2 tsp cardamom
• 2 eggs
• 115g unsalted butter, at room temperature
• 30g dutch process cocoa
• 1 tsp vanilla bean paste
• 40g unsalted butter, at room temperature
• 340g whole milk, lukewarm
• 15g cocoa
• 275g dark chocolate, chips, chunks, or callets