Morcilla is a classic spanish sausage made from pigs blood and spices. The two most typical varieties are morcilla de cebolla (onion) and morcilla de arroz (rice) although, like all spanish cuisine, there are regional differences. Morcilla de arroz is generally the type used when frying and it's easy to prepare this authentic spanish tapa in less than 10 minutes. Spanish-style blood sausage is available in latin grocery stores and via suppliers on the internet.