Dice pears & toss with lemon juice in medium - large bowl.
In separate bowl- combine brown sugar, cinnamon, nutmeg & cornstarch- whisk to combine. Set aside.
Transfer pears to 2 qt saucepan & heat over med-high heat about 8 minutes.
Some of the pears will break down into a thick liquid like sauce but you will still have some pear chunks.
Add your dry mixture & whisk to combine & incorporate well.
Heat & stir constantly until mixture thickens - about 2 minutes.
Remove from heat & let sit 5 minutes before transferring to your jars.
Store in refrigerator or freeze.