Sprinkle the yeast over the warm
water and let stand until dissolved, about 5 minutes. Place the flour, salt,
sugar, cinnamon, nutmeg, 1 1/4 cups of milk, butter and egg in a stand up
mixer. Pour the yeast mixture on top.  With the dough hook, mix for about
5 mins until well combine. If using raisins, add them and mix for additional 2
mins.

Cover and let
rise for 1 hour.After
1 hour, punch dough down and pour onto a floured surface.  Knead lightly
for about 1 to 2 mins.  Divide into 12 portions and shape into balls.
Place  8 pieces  into a greased 9x13 inch baking dish, and the
additional 4 in a 8x8inch baking dish. Cover with plastic wrap and set aside to
rise until doubled in size, about 45 minutes.

Preheat the oven
to 350 degrees F.
Remove the plastic wrap from the rolls. Mix 1 egg yolk plus milk and brush tops
off rolls.  Bake in the preheated oven until golden brown, 20 to 25
minutes. Remove from oven and brush with glaze.  Allow to cool completely
before adding frosting cross.

For Glaze, place sugar, water and vanilla in a small pot and cook for
about 5 mins.  Brush glazed over buns when hot.

Make frosting by whisking together the confectioners' sugar and 
milk  until smooth. When the buns are cool, drizzle frosting over them in
a cross shape.