But to answer your afrocentric question, the different empires each had their own established slave networks and infrastructure in Africa (logistics as has already been stated), see: 1  Arab slave trade. 2  Barbary slave trade. 3  Slavery in the Ottoman Empire.
Asparagus is a vegetable belonging to the lily family, which also includes onions, leeks and garlic. Eat asparagus as part of a heart-healthy diet, as it contains no fat, no cholesterol and very little sodium.
According to the Michigan Asparagus Advisory board, asparagus is rich in fiber, potassium and Vitamin B6, in addition to folic acid, thiamin and vitamins A and C. Preparing asparagus in a skillet enables you to cook it hot and fast, preserving its nutrients and its bright flavor.