Prepare your butter by cubing it into about ½-inch size pieces and keep this refrigerated. This can certainly be done ahead of time and be waiting in the refrigerator for your next steps.
Using your stand mixer fitted with the paddle attachment, place the flour, sugar, and salt in the bowl and mix it together briefly on low speed to combine.
Add the cubes of butter to the bowl of the stand mixer.
On low speed, mix the flour and butter together until they resemble small uneven size peas. If you listen while the mixer is working, you will hear it change tone as the butter becomes incorporated into the flour.
At small pea stage, add in 3.5 tablespoons of the ice water and mix for 10 more seconds. Then take a small bit in your fingers and squish it. Does it hold together? Then you probably added enough water. Is it a bit crumbly? Add in another tablespoon of the ice water.
Once the dough has formed, remove it to a lightly floured surface or parchment paper. Split it in two, wrap each piece separately. Weigh them out to be precise if you’d like. Wrap well and place in the refrigerator to rest for at least an hour before you roll them out. Even better leave them overnight or for as long as 3 days. If you need to wait longer, then freeze them and they will last for at least a month.