Cesky Cerny Chleb(Old World Black Bread)

Combine rye flour and all-purpose flour in a large bowl; reserve 3 cups flour mixture.

Sprinkle yeast over 1/2 cup warm water; stir until dissolved.

Set aside.

In a large bowl, stir together reserved 3 cups of flour mixture, cocoa, sugar, caraway seed, salt and instant coffee.

Combine 2 cups water, vinegar, dark corn syrup and butter or margarine in a medium saucepan.

Heat over low heat just until warm.

(Butter or margarine does not need to be completely melted.)

Add to cocoa mixture and blend well; add dissolved yeast and stir until thoroughly combined.

Stir in enough additional flour mixture, 1 cup at a time, until dough no longer clings to side of bowl.

Turn onto a lightly floured board; cover and let rest for 10 minutes.