Begin by toasting the almond pulp (or almond meal/flour). Preheat oven to 375 F and line a large baking sheet with aluminum foil. Spread the almond pulp in a thin, even layer over the sheet. Bake for about 30 minutes, until it begins to turn golden brown and fragrant (dry almond meal will require a shorter time in the oven). Let it cool for at least a few minutes before adding to the dough. You should end up with roughly 2 cups of toasted ground almond.
Either by hand or with an electric mixer, cream the butter until light and fluffy. Mix in the powdered sugar and vanilla, then the flours, then the toasted almond pulp. Cover the dough (don't use plastic wrap, use your butter wrappers!) and chill in the refrigerator until firm, at least 30 minutes.
While the dough chills, prepare the topping: measure the powdered sugar, nutmeg and salt into a shallow bowl, and mix to combine.
After the dough has chilled, use a teaspoon to scoop very small, bite-sized cookies and use your hands to roll them into balls. Place the cookies on a parchment-lined baking sheet (they do not spread and can be placed quite closely together). Bake at 375 F for about 15-18 minutes, until the bottoms are golden and the cookies are firm to the touch.
Within 5 minutes after baking, roll the warm cookies in the powdered sugar topping to coat the entire surface, then transfer to a rack to cool. After fully cool, store cookies in an airtight container and consume within a week.