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1. Eggs
Never cook eggs in their shells. Steam will build up inside
the shell during cooking and the egg will explode.
If you want to cook or reheat eggs which have not been
broken up by scrambling or mixing, you must always
pierce the yolks or these will also explode. You should
slice shelled hard boiled eggs before you reheat them in
your microwave oven.
2. Piercing
Always pierce food which has a skin or membrane, for
example, potatoes, tomatoes, apples, sausages etc. If you
don't pierce them, steam will build up inside and they may
explode.
3. Lids
Always remove the lids of jars and containers and take
away food containers, before you cook using your
microwave oven. If you don't, then steam and pressure
might build up inside and cause an explosion even after
the microwave cooking has stopped.
Shallow containers give more even cooking results.
Utensils made of china and ceramic excellent to use in your
microwave oven. Most types of glass are also very good.
Lead crystal glass can crack and should therefore, not be
used. Plastics and paper can also be used, provided they can
withstand the temperature of the heated food. For cooking
only use plastics, which will withstand a temperature of over
120˚C, e.g. polypropene and polyamide. Some plastic
materials, e.g. melamine, will be heated by the microwave,
and be damaged. To find out if a certain container is suitable,
the following simple test can be made:
Place the empty container and a glass of water inside the
microwave oven. The water is needed because the oven
must not be operated empty or with empty containers only.
Let the oven work on full power for one minute. A suitable
container will only be lukewarm.
Metal containers, e.g. saucepans or frying pans should not
be used in microwave ovens. Nor should plates or vessels
with decorations be used since metal e.g. gold, might be part
of the decoration and such decorations will be damaged.
Small pieces of aluminiuum foil can be
used, but only to shield the areas that
would over-cook (e.g. for covering chicken
wings, leg tips and fish tails) but the foil
must not touch the side of the oven as
damage may occur.
Microwave function only
Utensils and cooking containers used in a microwave oven
should be of a material that does not act as a barrier to
microwave energy. Generally this means that you should cook
in either (paper), plastic, glass or ceramic. Metal pans reflect
microwave energy and inhibit cooking, and should not be used.
In addition to material, the shape of the container should also
be considered. Round oval shapes give the most even
cooking. Square or rectangular containers may over-cook
foods in the corners because more energy is absorbed there.
TO AVOID EXPLOSION AND SUDDEN BOILIING
Only use utensils that are suitable for use in microwave ovens.
Before use, the user should check that utensils are suitable for use in microwave ovens.
WHICH UTENSIL CAN BE USED IN THE OVEN?
WARNING
Liquids, such as water, coffee, or tea are able to be
overheated beyond the boiling point without appearing to be
boiling due to surface tension of the liquid. Visible bubbling
or boiling when the container is removed from the
microwave oven is not always present. this could result in
very hot liquids suddenly boiling over when a spoon or other
utensilis is inserted into the liquid.
To reduce the risk of injury to persons:
a) Do not overheat the liquid.
b) Stir the liquid both before and halfway through heating it
c) Do not use straight-sided containers with narrow necks.
d) After heating, allow the container to stand in the
microwave oven for a short time before removing the
container.
e) Use extreme care when inserting a spoon or other utensil
into the container.
Caution:
• There are a number of accessories available on the
market. Before you buy, make sure they are suitable
for microwave use.
• When you put food in the microwave oven, make sure
that food, food supports or covering do not come in
direct contact with any of the internal walls or the ceiling
of the cavity since discolouration may take place.
Glass (general) No Yes (1) No
Glass (heat resistant) Yes Yes Yes
Glass-ceramic and
ceramic (heat resistant) Yes Yes (1) Yes (1)
Earthenware Yes Yes Yes
China (heat resistant) Yes Yes Yes
Plastic (general) No Yes (2) No
Plastic (heat resistant) Yes (2) Yes (2) Yes (2)
Aluminium foil containers
/aluminium foil Yes Yes (3) Yes
Metal baking tins Yes (4) No Yes (4)
Metal (pots.pans, etc) Yes No No
Paper No Yes No
1. Without metal parts or metal trims.
2. Some plastics are heat-proof only to certain temperatures.
Check carefully!
3. It is possible to use aluminium foil to shield deliate areas of
food (this prevents over-cooking).
4. Metal tins can be used in the combination methods,
however if these are very deep, they will greatly reduce the
efficiency, as metal shields the microwave energy from the
food.
Material
Grill &
Convection
cooking
Microwave
cooking
Combined
cooking