1 pineapple peeled and cored will be about 430g I added a little of the softer core to make up the balance. But it isn't fussy if you have 20g less pineapple you may just need to simmer the conserve for a little longer.
Cutting the pineapple into pieces that will then be the final product. The fruit in the conserve do not lose their shape, big pieces do not disintegrate as you cut them will be how the end product will be.
Testing:
The temperature on a thermometer will be 100 degrees.
If you do not have a thermometer put a teaspoonful of the conserve onto a cold plate and not straightway or you will burn your skin, draw your finger through the mixture, the conserve should stay on either side and not pool back together..
If it runs straight back together then simmer for another 5 minutes and test again on another cold plate.