There are a couple of very famous (to foodies!) recipies with chocolate as a serious ingredient. I think one was 'Turkey & Chocolate Sauce'. You use dark chocolate. The bitterness is its key contributing aspect to the dishes.

MasterFoods Australia did (I suspect a trial run only) a "Cocoa Pepper" dry blend sprinkle bottle condiment - a truly amazing bitter sweet taste (marked as 'Mild') for barbequed steak & chicken - it also contains cassia, sugar, salt, 'spices'.