Pulse the flour, salt, and sugar in a food processor until combined.
Add butter and pulse until the mixture resembles coarse meal.
Sprinkle with ice water and mix until the dough holds together.
Roll the dough on a floured surface to a 1/4-inch thick circle.
Cut it into 3-inch circles using a floured cookie cutter and place in tart tins.
Preheat your oven to 400°F (200°C).
In a bowl, mix brown sugar, melted butter, raisins, heavy cream, egg, and vanilla.
Fill the prepared tart shells with the sugar and butter mixture, leaving a bit of space at the top to prevent overflow.
Bake for 15 to 20 minutes, or until the filling is bubbly and the crust is golden.
Let the tarts cool before serving.