Add the almond flour, tapioca starch, baking powder, and salt to the bowl of your food processor, and pulse to mix.
Add the egg, lard, and vinegar and pulse several times to combine. Continue pulsing until the dough holds together when pressed with your fingers. Add cold water, 1 teaspoon at a time as needed, if the dough will not come together.
Remove the dough from the food processor bowl and lightly knead until smooth. Use additional tapioca starch to prevent sticking.
Divide the dough into 2 equal portions and tightly wrap the unused portion in plastic wrap when not being used.
The dough can be carefully rolled out between 2 sheets of parchment paper or pressed into a pie plate using your fingers.
For a prebaked, single pie crust: Preheat the oven to 350°F and bake for 15 minutes, or until crispy.