Since food is such an integral part of any culture, it is expected that British and American English would have very different vocabulary for food. The following are some of the new terminologies that I had to 'relearn' when I first came here three years ago:
UK / US
rocket / arugula
swede / rutabaga
spring onions / scallions
crisps / chips
chips / French fries
treacle / molasses
icing sugar / confectioner's sugar
digestives / graham crackers
digestives / graham crackers
sultanas / raisins
muesli / granola
skimmed milk / non-fat milk
cling film / plastic wrap
cornflour / cornstarch
etc...