Sweet orange zest

"Native to the Mediterranean and the tropics, the fruit of Citrus sinensis is called 'sweet orange' to distinguish it from 'bitter orange' (Citrus aurantium). The birthplace of this orange tree is located between the Himalayas and China of the South It was brought back by the Portuguese around 1400. Since then, its culture has spread considerably in several countries.
The sweet orange tree, a small tree in the Rutaceae family, is an old hybrid, probably the result of a cross between Citrus maxima and Citrus reticulata. "