Miele M 6012 SC Operating Instructions Manual page 21

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Do not reheat food in the oven in heat-retaining bags intended for
use in normal ovens. These heat-retaining bags usually contain a
thin layer of aluminium foil which reflects microwaves. This reflected
energy can, in turn, cause the outer paper covering to become so
hot that it ignites.
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Eggs can be cooked without their shells using microwave power
only if the yolk membrane has been punctured several times first.
The pressure could otherwise cause the egg yolk to explode.
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Eggs can only be cooked in their shells in the microwave oven in
a specially designed egg-boiling device available from specialist
shops. Eggs can burst, even after they have been taken out of the
oven.
Do not heat up hard-boiled eggs in the microwave oven.
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Food with a thick skin or peel, such as tomatoes, sausages,
jacket potatoes and eggplants, should be pierced or cut in several
places to allow steam to escape and prevent the food from bursting.
Warning and Safety instructions
21