1. True cinnamon, sometimes called Ceylon cinnamon , is preferred in Mexico and England. 2. Ceylon cinnamon , on the other hand, is the " true " cinnamon.3. 1 / 4 teaspoon ground Ceylon cinnamon or more to taste 4. 1 2-inch piece canela, or 2 teaspoons ground Ceylon cinnamon ( see note) 5. Cassia is sometimes added to Ceylon cinnamon , but is a much thicker, coarser product. 6. Or for $ 25 a pound, there is true Ceylon cinnamon from Sri Lanka. 7. Wisconsin-based Penzeys Spices offers Korintje Cassia, China Cassia, Extra Fancy Vietnamese Cassia and Ceylon Cinnamon . 8. Ceylon cinnamon , the true cinnamon from Sri Lanka, is the priciest, at $ 25.90 a pound.9. Levels of the blood-thinning agent coumarin in Ceylon cinnamon are much lower than those in cassia. 10. In Mexico, Ceylon cinnamon , called canela there, is used in stick form in sauces and stews.