It doesn't get much better than warm blueberry sauce cascading down lemon bars as an end of summer sweet treat.
I prefer a heavy vanilla flavor. If you don't, cut it to 1/4 tsp vanilla extract.
If you don't like lemon, try orange juice instead.
Some cooks strain the sauce through a sieve, but I like my sauce with softened berries.
Stores best in an airtight container in the refrigerator.