Challah Fame with Apple and Leek

Name: Challah Fame with Apple and Leek
Ingredients: 2 packets (about 4 1/2 teaspoons) active dry yeast; 1 cup warm water; 1/2 cup apple juice; 1/3 cup brown sugar; 2 tablespoons honey; 2 teaspoons sea salt; 1/2 cup pareve margarine or vegetable shortening (plus 2 tablespoons for sautéing filling); 6 cups flour; 3 large eggs, lightly beaten; 1 egg yoke for glazing; 2 leeks, washed, trimmed and sliced; 1 apple, peeled, cored and chopped; 1/4 cup walnuts finely chopped; 1 tablespoon anise seeds