In a small bowl, dissolve yeast in warm water.
Let stand until creamy, about 10 minutes. Warm the milk in a small saucepan until it bubbles, then remove from heat.· 10m
Mix in 1 cup butter until melted.
Let cool until lukewarm.
In a large bowl, beat together the eggs and 1 1/2 cups sugar.
Mix in the nutmeg, orange extract, vanilla extract, and the yeast mixture.
Stir in 3 cups flour and the salt.
Stir in 1/3 of the milk mixture.
Mix in the remaining flour and milk mixture in two alternating additions.
Cover bowl, and let rise until doubled, about 45 minutes.· 45m
In a small bowl, prepare the topping by cutting together 1/2 cup butter and 2/3 cups sugar until mixture resembles coarse crumbs.
Preheat oven to 350 degrees F (175 degrees C). Lightly grease 3 10-inch Bundt pans.
Divide dough into the prepared pans, and sprinkle with the topping mixture.
Bake in preheated oven for 30 to 40 minutes, until a toothpick inserted into center comes out clean.· 35m