Mix milk and yeast, and let stand for 3 minutes. Add flour, sugar, salt, cardamom, and 8 tablespoons butter in a mixer with dough hook, and mix for 3 minutes. Add the yeast milk and mix well. Mix in eggs and egg yolks Place the dough in a bowl, cover, and place in fridge for at least 2 hours or overnight. Preheat oven to 380°F. Roll out to a large rectangle, about ¼” thick. Smear butter on ²⁄3 of the dough and sprinkle with rest of the sugar. Roll up to a long sausage and cut it into 1″ thick slices. Place the slices on a parchment papercovered baking tray and let them rise for 30 minutes. Bake for 30–40 minutes. Mix confectioners’ sugar and water until a thick glaze forms. Drizzle over the buns while warm.