Combine finely ground nuts with flour, sweetener, and flavorings; bind the mixture with just enough fat; press the crumb into a removable-bottom tart pan; bake, and let cool. That’s all you need to do before you can load tender crust up with any unbaked creamy filling or even ice cream. Using a removable-bottom tart pan makes the prettiest presentation, but you can bake the crust in a well-oiled pie pan instead.