GE Appliances JES1456 Owner's Manual page 27

Microwave terms.
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Definition
Arcing Arcing is the microwave term for sparks in the oven. Arcing is
caused by:
metal or foil touching the side of the oven.
foil that is not molded to food (upturned edges act like
antennas).
metal such as twist-ties, poultry pins, gold-rimmed dishes.
recycledpapertowelscontainingsmallmetal pieces.
Covering Coversholdin moisture, a llowfor moreevenheatingand reduce
cookingtime.Ventingplasticwrap or covering with wax paper
allowsexcess steamto escape.
Shielding In a regular oven, you shield chicken breasts or baked foods to
prevent over-browning. When microwaving, you use small strips
of foil to shield thin parts, such as the tips of wings and legs on
poultry, which would cook before larger parts.
Standing Time When you cook with regular ovens, foods such as roasts or cakes
are allowed to stand to finish cooking or to set. Standing time is
especially important in microwave cooking. Note that a
microwaved cake is not placed on a cooling rack.
Venting After covering a dish with plastic wrap, you vent the plastic wrap by
turning back one corner so excess steam can escape.
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