Parkinson Cowan SIG 555 - Manual (Page 15)

Roasting
For best results we recommend open roasting using minimal fat or oil to
prevent splashing.
It is not necessary to cover meat or poultry or wrap food in foil when
roasting as this restricts the circulation of heat and will lead to extended
cooktimes.
If you use a roasting bag or cover chicken breast with foil, be prepared
to allow an extra 10 - 15 minutes for each 1/2kg (1lb).
When cooking large items such as turkeys, the use of foil may be
required to prevent the breast becoming dry before the rest of the bird is
fully cooked.
Condensation
Condensation may form on the appliance. This is quite normal and
nothing to worry about. The condensation forms when heat and
moisture are present, for example during cooking. Whenever possible
try to make sure that food which contains a lot of moisture, for example
casseroles, are covered. If you do notice any condensation, wipe it up
straight away.
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The ovens