I've never tried hot chocolate with pepper and thought it added a nice little bite to the drink. I'll admit that I used red hot pepper instead cayenne since I had that on hand and figured anything hot would work :-). I also used honey in place of the agave nectar. I absolutely love agave nectar, but usually go with honey becuase of the cost. In the end, I was quite pleased with the drink :-).
So, if you're looking for a vegan cookbook with some easy, flavorful recipes with a "gourmet twist," I would recommend Speed Vegan. Book Publishing Company has a great assortment of vegan and vegetarian books. Even though I'm not personally vegan (or vegetarian), I truly enjoy vegan and vegetarian cookbooks as I try to eat a more plant-based diet.