Chelsea Buns

Dough

• unsalted butter, for greasing
• 400 g plain flour, plus extra for dusting
• 220 g milk
• 1 tsp ground mixed spice
• 1 tsp fine sea salt
• 2 tsp dried instant yeast
  hoặc 15 g fresh yeast, crumbled
• 2 Tbsp caster sugar
• 1 medium egg

Filling

• 50 g unsalted butter, soft
• 50 g caster sugar
• 75 g currants
• ½ tsp ground mixed spice

Drizzle

• 50 g icing sugar
• water, for mixing