When we came back from our vacation our guava tree was covered with fruit and had already dropped some overripe guavas. We picked about a dozen, so today Madison helped me preserve our excess :) I found a canning recipe online and we got started. First you peel and de-seed the guavas - we couldn't bring ourselves to dispose of that much fruit so we have one jar with seeds :) Then you heat it in a light syrup (brown sugar and water) and pour it in the jars. Then you boil your jars in a large pot of water for twenty minutes and - as they cool - listen for the "ping". I never heard the magical ping but the tops don't pop anymore so I assume all is good.
Of course now that they are perfectly preserved all we want to do is eat them!