traditionally the wafer snack has been made using milk chocolate, dozens of
different flavours are proving popular in Asia.

Flavours like wasabi and green tea have helped Kit Kat sales in Japan grow by
50% since 2010, Nestle said.

The factory will focus on the more expensive versions of the snack which have
been a hit with tourists.

Spending by visitors on confectionery has more than tripled in the past four
years, according to government figures, to about $1.2bn (£922m).

“Over the past few years, Nestle was able to demonstrate good growth in
Japan despite a challenging environment”,
 a Nestle spokesman

“This good performance can be explained with our strategic focus on
innovation and premium, for example with Kit Kat.”