Panforte literally means “strong bread”. It is a traditional Italian Christmas food dessert originally from Siena, Italy thus it is also known as Siena Cake. It contains nuts, honey, almond, candied fruits and a lot of spices. The origins of this cake can be traced to honey-fruit cakes during the middle ages.
Pepper used to be one of major ingredients of the original Panforte recipe (called Panpepato). Today, the most common recipe is called Panforte “Margherita” in honor of Queen Margherita in the early 1800’s.
There are a lot of Panforte recipes in the web. But you can check these two sites