How to Can Pineapple Chunks 🍍 Peel, core, and chop your pineapple. Put the cores in a pot and cover with water. Bring to a boil and simmer for 15 minutes to create your “syrup”. Fill each quart jar with chopped pineapple and ladle syrup on top, leaving an inch of headspace (empty space at the top of your mason jar). Clean the rims off and then put on your lids and rings. Place the jars in your canner. Process in the boiling water bath canner or steam canner for 20 minutes for quarts (15 minutes