Preheat the oven to 350°F. Make sure your bottom oven rack has enough space above it to fit the tart.
Grease a 10-inch tart pan with a removable bottom and set aside.
In a mixing bowl with a hand mixer or stand mixer on medium speed beat the butter, powdered sugar, vanilla, and almond extract together until light and fluffy.
Add the flour and mix until a dough forms. Set aside ½ cup plus 2 tablespoons (173 grams) of the dough for the topping.
Press the remaining dough evenly into the prepared tart pan, covering both the bottom and sides. It may look like there isn’t enough, but spread it gently and it will fit. If you see gaps, use a little of the topping dough to patch.
Place the tart pan in the freezer for a few minutes while you prepare the filling.
In a small bowl, stir together the jam and lemon juice. Remove the tart pan from the freezer and spread the jam mixture evenly over the bottom crust.
Take the reserved dough, tear it into small pieces, flatten slightly, and arrange them over the jam, leaving gaps so the filling peeks through. See photos in the blog post above.
Place the tart on the bottom rack of the oven and bake until set, about 20 minutes.
Move the tart to the center rack and continue baking about 20-25 minutes until the crust is golden brown, covering with foil if it starts to brown too quickly.
Let cool before removing from the pan, slicing, and serving.