At any given moment, there are usually no less than three types of frozen berry in my freezer. I got tired of shoving bags of them out of the way to reach other things, so I decided to combine a bunch and make a puree that I could use to flavor plain yogurt, pour over pancakes (The H doesn't care for syrup), and who knows what else.
This began as roughly two cups of strawberries (thawed), one cup of blueberries (semi-thawed), and 1/2 cup blackberries (frozen). To cut the tartness, I also added 2/3 teaspoon of stevia.
When it was smooth, I poured it into ice cube trays, with the intent of popping them out into a freezer bag once they were frozen.
Today I pulled out two cubes to thaw in the fridge throughout the day, then mixed with about 1/2 cup plain low-fat yogurt as part of my afternoon snack (total thaw time was approximately four hours).