Yes it is true that Seville oranges are bitter.
Spain
seville
Seville
oranges are grown in Seville it is very hot there
There are several varieties of orange: the bitter Seville orange from Spain; the Clementine (a variety of Mandarin orange) from Morocco; the Blood orange, from Italy (originally from Sicily but now grown in US) ; the Jaffa orange (very sweet and almost seedless) from Israel; the Valencia orange which was created in California; and the Navel orange.
By distilling the peels of bitter oranges.
Bitter and Acidic. Found in oranges and many juices
There are a few key differences between navel and Valencia oranges. Navel oranges are sweeter, and appear to have a navel on the outside. Valencia oranges are more bitter and come specifically from Valencia, Florida.
Grand Marnier is a type of triple sec, a liqueur containing cognac, and flavoured predominantly with bitter oranges.
Paddington Bear loves marmalade. Marmalade is made from citrus fruits. The most popular one is Seville oranges.
probably because normally oranges are proffesionally squeezed and all that. but mostly they are condensed too so i think you are supposed to add water and sugar and all that but im not for sure. you should try looking on the back of a orange juice container and see what it says that should help you. =)