Vegetables are a very important part of our food supply.
Processing extends the season of perishable vegetables.
Although the best sensory qualities are obtained
by freezing, the increased energy requirements involved
in maintaining products in a frozen state mean that
this is an expensive alternative. Heat preservation
(canning) provides a shelf-stable product but usually at
the cost of colour, flavour, and texture (Shewfelt
1990), for which reason consumers have increased
their purchase of frozen vegetables