In a small bowl, combine warm milk, yeast, and 1 teaspoon sugar. Let sit for 5–10 minutes until foamy.
In a large bowl, whisk flour, remaining sugar, salt, cinnamon, nutmeg, and allspice.
Add yeast mixture, melted butter, eggs, and orange zest. Mix until a soft dough forms.
Knead for 8–10 minutes until smooth and elastic.
Gently knead in raisins or currants until evenly distributed.
Place dough in a greased bowl, cover, and let rise until doubled, about 1–1½ hours.
Punch down dough and divide into 12 equal pieces. Shape into smooth buns.
Place buns on a lined baking sheet. Cover and let rise again for 30–45 minutes.
Preheat oven to 375°F (190°C).
Mix flour and water to form a thick paste. Pipe a cross over each bun.
Bake for 18–22 minutes until golden brown and cooked through.
Cool slightly before serving.