In a large bowl, whisk together the hazelnut meal, jaggery, baking powder, baking soda, black pepper, and salt. Add the egg, melted butter, hazelnut extract, chocolate, and ginger and stir with a large wooden spoon until the dough comes together. Grease your hands with a little oil to prevent the dough from sticking. Divide the dough into twelve equal parts and shape them into balls. Flatten them into 2 in [5 cm] rounds. Place the rounds on a baking sheet lined with parchment paper. Wrap the entire baking sheet tightly in plastic wrap and place in the freezer for at least 10 minutes, and preferably 2 hours.