Combine the dry ingredients (flour, sugar, and salt) in a medium-large size bowl and stir to combine. Make a well in the center and set aside.
Place the butter in a microwave-safe, medium-size bowl. Cover with a slightly damp paper towel. Cook on high power for 1 minute or until melted. (if you don’t have a microwave you can melt the butter on the stovetop in a small saucepan.)
Pour the butter into the well, making sure to scrape the bowl to include all of the butter. Add the 1 tablespoon of water and stir until the dry ingredients are incorporated and the dough comes together and/or forms large crumbles. If the dough seems dry, you can add a tiny bit of extra water.
While the dough is still warm crumble two thirds of it around the edges of the prepared tart pan. Press it evenly around the sides and out onto the outer edges of the bottom of the pan.The sides should be a little thicker than the bottom for structural support.
Crumble the remaining dough into the open space in the pan. Press it in firmly with your fingers and the palm of your hand until the tart pan is completely lined with dough. If the dough seems sticky, you can dust your fingers with a small amount of flour.
Use a straight-sided, round measuring cup or a flat bottom glass to smooth out the edges and further compact the dough in the bottom of the pan. Dip the cup or glass in flour if there is any problem with stickiness.
Prick the dough all over the bottom with a fork to prevent puffing.
Place the tart pan on the prepared baking sheet and bake for 10 minutes. Remove the sheet pan (and tart pan) from the oven. Using the same measuring cup or flat bottom glass, gently press the edges again (if they have shrunk down a bit, you can press them back to be even with the top of the pan) and smooth out the bottom if there are any bumpy places.
For a crust that will have a baked filling, return it to the oven and bake until the crust is pale golden brown, another 5-7 minutes. (Allow the crust to cool for at least 10 minutes before filling and returning to the oven.)
If using a no-bake filling for your tart, return to the oven and bake until it's a medium golden brown, about 12-17 minutes longer. Set aside to cool completely before filling.