barley sugar

from The American Heritage® Dictionary of the English Language, 5th Edition.

• noun A clear, hard candy made by boiling down sugar, formerly with an extract of barley added.

from The Century Dictionary.

• noun Sugar boiled (formerly in a decoction of barley) till it becomes brittle and candied.

from Wiktionary, Creative Commons Attribution/Share-Alike License.

• noun A traditional British boiled sweet, yellow or orange in colour, with an extract of barley added as flavouring.

from WordNet 3.0 Copyright 2006 by Princeton University. All rights reserved.

• noun a brittle transparent candy made by melting and cooling cane sugar