Combine sugar, flour and salt in a mixing bowl with a whisk until evenly mixed and set aside.
Combine egg yolks, vanilla scrapings/extract and buttermilk.
Incorporate egg yolk mixture into dry mixture and whisk briefly. Place mixture into a heavy-bottomed sauce pan and bring to a simmer, whisking constantly. Cook 3-4 minutes while whisking.
Immediately place the bottom of the saucepan into an ice bath and whisk occasionally while cooling ten minutes.
Evenly distribute the still-warm pastry cream into each of the mini tart shells and cover with blueberries. Serve promptly while cream is slightly warm. Garnish with mint.
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