Add the liquid
Sprinkle the dough with a little ice water—one tablespoon at a time. After each tablespoon, mix in the water gently with a fork. Don’t add in too much liquid, you don’t want sticky dough. Start with the minimum amount called for in the recipe you’re using.
The mixture might look dry and crumbly after you add the liquid, but don’t add more. Instead, test the dough by picking up a handful and squeezing. If it sticks together, it’s perfect.
If it’s still too crumbly, add another half tablespoon of liquid, lightly toss the mixture, and test again.
Avoid overworking the dough so you don’t end up with tough pastry.