Make the crust by combining the flour and sugar in the bowl of a food processor, cut up the cold butter and drop in the bowl
hit pulse until the mixture resembles coarse crumbs
mix the egg with the lemon juice and 2 teaspoons of water
pulse the egg mixture into the flour-butter mix, if the dough doesn't hold together add the last teaspoon of water
remove from the processor and knead lightly to form a soft dough, cover and refrigerate for 15 minutes
preheat the oven to 395˚ F
roll out the dough and line your tart pan with it, trim the edges
refrigerate 10 minutes if your kitchen is really warm
lay a piece of parchment paper over your dough, cover with dry beans to blind bake your pastry
bake 10 minutes, then removed the beans, bake another 5
once the tart shell is out of the oven start the frangipane filling of the Bakewell Tart
beat the butter and sugar together, then beat the eggs in, if you're using a stand mixer use the paddle attachment
stir the all-purpose flour and almond meal together, break up any large clumps of almond meal
add the dry ingredients to the butter and sugar mix and stir to combine
add the flavoring if using
spoon the raspberry jam in the tart shell, spread to the edges
spoon the frangipane filling over the top and spread evenly, covering the raspberry jam layer
bake 10 minutes, and sprinkle on the sliced almonds
bake another 15 minutes, if your crust starts to brown too quickly take a piece of foil, cut the center out, and lay it over the tart so the middle is showing but the crust is covered and it will not brown anymore
cool before serving