Fresh Blueberry Hamantaschen Filling

This is a tasty jam-like filling, thickened with corn starch, that tastes of the fresh fruit. Even though I started with frozen berries, it took only minutes to make.

I thought it was a little too sweet so I'll reduce the sugar next time but I'm not certain how to fix the problem of some liquid separating out during cooling and subsequent refrigeration. I used only the thick, fruity part to fill these cookies, leaving the liquid behind and that worked fine as the cookies weren't soggy and the baked filling was still moist.