On one of our walks, we noticed a sign across the street from our cottage: "Yellow Plums. Pick 'em and Take 'em." We followed the signs and found a single tree laden with yellow plums. We waved to the owners, who stayed in their house, and picked a bunch. They were delicious.
I took enough back to make a small crisp. I didn't have all the ingredients (like sugar or flour), but I had butter, and maple sugar oatmeal packets, so I mixed those up and sprinkled that over the top. For serving, we had some maple syrup to drizzle over the top.
How nice of those people to share!