01 - In a large bowl, combine flour, caster sugar, mixed spice, cinnamon, nutmeg, salt, and yeast. Place salt and yeast on opposite sides of the bowl to prevent yeast inhibition.
02 - Add softened butter, lukewarm milk, and egg to the dry ingredients. Mix thoroughly to form a soft, slightly sticky dough that holds together.
03 - Turn dough onto a lightly floured surface and knead for 8–10 minutes until smooth, elastic, and passes the windowpane test. The dough should spring back when pressed.
04 - Place dough in a greased bowl, cover with plastic wrap or damp towel, and let rise in a warm, draft-free area for approximately 1 hour until doubled in size.
05 - Punch down risen dough to release air. Knead in currants, mixed peel, and orange zest until evenly distributed throughout the dough.
06 - Divide dough into 12 equal portions. Roll each piece into a smooth, tight ball and arrange on a parchment-lined baking sheet, spacing them 1–2 inches apart.
07 - Cover loosely with oiled plastic wrap and let rise for 45–60 minutes until puffed and buns are just touching each other.
08 - Preheat oven to 400°F for conventional baking.
09 - Mix plain flour with water to create a thick, smooth paste with pipeable consistency. Transfer to a piping bag fitted with a small round tip.
10 - Pipe a cross shape over each risen bun, applying even pressure for clean lines. Ensure paste adheres well to surface.
11 - Bake for 20–25 minutes until golden brown and sound hollow when tapped on the bottom. Internal temperature should reach 190°F.
12 - Warm apricot jam until fluid and brush over hot buns immediately for glossy finish. Cool on wire rack for at least 15 minutes before serving.