Make Lemon Pudding Filling as per instructions, I was too lazy to make from scratch but this would be a delicious option
In a sauce pan, add 2 cups of Saskatoon berries and white wine, bring to a boil and settle to a low simmer for 5-8 minutes, allow alcohol to boil off and berries to soften but not burst.
Add sugar and stir, remove from heat
Add cornstarch and mix allowing to thicken. Add cream of balsamic and mix.
Add lemon pudding filling to half the tart shell, top the remainder with Saskatoon berry mix. Allow to cool 30 minutes before serving.