What Is Allspice?
The name might suggest it is a blend, but allspice is a single spice made from dried berries of the allspice tree which look like peppercorns.
Whole vs. Ground
Allspice can be used in ground form or whole. Once ground, allspice quickly can lose its pungency. Ground spices are more intense than whole cloves or berries. Whole allspice berries are sometimes used in stews and soups, and for pickling and brining. You will certainly have better success using the ground version in desserts, such as pumpkin cake or pie, spice cakes, and gingerbread.
What Does It Taste Like?
Allspice combines the flavors of cinnamon, nutmeg, cloves, and pepper. It can be used for many purposes that those warm spices are used, or as a substitute for them.