Cookbook

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Let o some steam!

A powerful blender can pulverise a variety of ingredients

in a minute or less. The high speeds and collisions of the

ingredients creates friction, and this friction can create

quite a lot of heat. A powerful blender on high speed, for

example, can heat liquid by as much as C in just one

minute.

The Boss™ uses the friction created during the hot soup

function to turn cold ingredients into heated soup in

around  minutes. But, as well as heating soups in a

blender, some chefs like to blend already cooked soup just

before serving to either combine additional ingredients,

or to aerate the liquid and create a creamier texture. But

beware! In most blenders, blending hot liquids is fraught

with danger.

As ingredients rise in temperature, they start to release

their water content in the form of steam, from C

and above. Water expands by an incredible  times

when it turns to steam, meaning that just  teaspoon of

water will evaporate to become over  litres of steam.

If this temperature rise happens slowly, it is usually

reasonably safe. But when you blend hot soup, the cold air

inside the blender is pushed into the ingredients almost

instantaneously and the change of pressure is intense. If

this steam has nowhere to escape, pressure will rise to an

explosive point very quickly.

This is one of the causes for blender lids popping o when

blending hot ingredients. This dangerous explosion of hot

ingredients means that regular blenders can’t usually be

used safely, either for heating, or for aerating soup. So the

Boss™ has been designed with a tightly sealed and vented

lid, to hold the lid in place under pressure, and to allow

steam to escape progressively while blending without

allowing liquids to splash out. Not only that, but the Soup

program uses a soft start to avoid creating any sudden

bursts of hot liquid, as well as a gentle stir at the end of

the cycle to help fold in any steam bubbles that may have

formed. This means you can safely create soups from cold

to hot, or from cooked ingredients.

Remember that it’s best to allow the ingredients to cool

well below boiling point and never ﬁll the blender above

the . litre mark on the blender jug when blending hot

liquids.

Steamy pressure explosion Safe steam vent lid

Other blender the Boss™