"sf" > wrote in message

> One was about re-preserving things like the unused half of a can of
> tomato paste and the other was a reminder about differing
> wattage/voltage between the US and Aus.

The wattage is the important item mentioned in the book - you need to know
the wattage of your microwave to determine the time for cooking a jar of a
particular size.

Since things electrical confuse me completely, I can offer no more
illumination other than to tell you what wattage my machine operates at and
how long it takes to do the preserving of 1 x 375gram old salsa jar in my
microwave. In addition, I can add that a minute should be added for each
additional jar added to the oven up to a maximum of 4 jars done at one
sitting.