This recipe adapts well to any favortie summer stone fruit; just make sure you end up with 4 cups of processed fruit. Also feel free to adjust or change the flavoring to your taste. In this recipe, the ginger adds a pleasant spicy brightness to the big round flavors of fully ripe peaches and plums. I like a little texture in jam, so just mashed the fruit, squeezing with my hands to control the chunkiness. If you like smoother jam, feel free to whirl away in a blender or processor. And if you aren't comfortable or familiar with water-bath canning, storing this jam in the freezer works just fine too.