Store spices in their jar in a cool, dark cupboard. If grinding, do so just prior to use as pre-ground spices lose flavor and aroma over time.
Grains of paradise are best ground before use, and pair well with lemon, cinnamon, cloves, potatoes, eggplants, and lamb (particularly in Moroccan tajines). They can be infused into a variety of different alcoholic beverages (historically most often wine or beer), and can be used in spiced fruit desserts (particularly those involving peaches or plums)
They can also be used similarly to black peppercorns in most dishes, imparting a hotter flavor with pine notes.
How to Grind Whole Spices