Put 3 cups flour into a large bowl. Make a well in the center. Dissolve yeast in warm water mixed with 2 T. sugar. Allow yeast to proof. Pour into well. Add 1 cup sugar and the salt.

Melt 1/2 cup butter into the milk. Remove from heat and mix in the oil. Beat the butter mixture into the flour a little at a time., alternating with the eggs. Then beat in 2-3 cups more flour until the mixture is no longer sticky.

Knead on floured surface for 8-10 minutes until smooth. Oil a large bowl. Roll the dough in the bowl until all surfaces are covered with oil. Cover with a tea towel and let rise in a warm place until double in size. Punch down dough and turn out on the counter. Cover and let rest for 10 minutes.

Divide the dough into 4 parts. Roll each part into a rectangle 1/8" thick. Brush with melted butter. Combine topping ingredients and sprinkle on rectangles. Roll each like a jelly roll and place around a greased tube pan. Cover and let rise again until double in size. Brush top of babka with melted butter.

Bake in a 300 degree oven for 1 hour. Remove from pan and let cool on a a cooling rack.