Bake a sweet tart dough in a 9-inch fluted removable bottom tart pan until golden brown.
Make caramel by combining water, sugar, and corn syrup in a saucepan. Cook until medium amber, then add room temperature heavy cream.
Stir in vanilla extract, kosher salt, and 6 ounces of blackberries. Cook until blackberries soften and release their juices.
Soften gelatin in cold water, then add to the caramel mixture.
Arrange 12 ounces of blackberries in the tart shell.
Strain the caramel mixture and cool it in an ice bath until thickened.
Pour the caramel mixture into the tart shell around the berries.
Chill the tart for at least 4 hours until the filling is set.
Slice and serve the tart for a beautiful and elegant dessert.
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