Place the small cubes of butter in a bowl inside the freezer for 20 minutes. Meanwhile, in a large mixing bowl stir the flour, sugar & salt together.
After 20 minutes, add the cubed butter to the bowl. Cut it into the dry mix using a pastry cutter until the flour is coated & approx. the size of a pea.
Stir the ice-cold water into the mixture 2 tbsp at a time until the dough starts to stick together. You want it to feel like a somwhat sticky dough, but not too moist.
Place the ball of dough onto a lightly floured surface & gently fold in some additional flour. Re-form it back into a ball, then flatten into an inch-thick disk & wrap in plastic. Chill in the fridge for about two hours (at least).
After chilling, place the dough back onto the floured surface & slowly start to roll it out. Once it's large enough to fit your tart pan, ~carefully~ lift the dough and press it into the pan.
Use a paring knife to trim any extra dough around the edges & use the excess to fill in any thinner sections, if needed. Ideally, you want an even thickness around the entire circumference.
Wrap the pan/shaped crust in plastic & chill again in the fridge for at least 30 minutes. Pre-heat the oven to 400°F (or 375°F if using a convection oven).
After chilling, unwrap the crust, place a piece of parchment paper over the top & fill the center with pie weights. Bake for about 15 minutes, then remove parchment paper/weights, stab a few holes in the base with a fork & bake for another 8 minutes (until it starts to lightly brown).
Remove the par-baked crust & let it cool. Turn the oven down 25°.