Frozen yogurt is always a great dessert – it feels like a special treat yet with only four ingredients, it is easy to make. I keep the freezer bowl of the ice-cream maker in the freezer all the time so it is always ready to go.

Yesterday I wanted to make blueberry frozen yogurt from the blueberries I picked at a blueberry patch last summer. Only when I was about to strain the cooked fruit through a sieve did I realize those were not blueberries! Those were the precious Concord Grapes I had set aside for my Stuffed Flatbread.

I was too far along to change course, also short of time and lacking a better solution what to make with 1½ cups grape concentrate. So I went ahead with my standard frozen yogurt recipe. To give it a hint of Christmas flavor, I added ¼ teaspoon freshly ground cardamom. It turned out fine; in fact, it got a full approval rating at the dinner table from my family and a guest. Funny, I would have never thought of making Concord Grape Frozen Yogurt, and now I have a recipe that is worth keeping.

Against my usual habit, I had not labeled the bags with blueberries, thinking their content was far too obvious. Then I simply forgot that I had snuck in a bag of grapes in late summer. Lesson from this: always read the label – after you make sure there is one.