You can put in food processor and bring together until dough is formed, or do this by hand.
Whisk together flour, sugar, salt. Mix in lemon zest and using fingers evenly distribute. Add cold butter and make sure all butter is covered with flour. Mix with fingers until it looks like course meal. Put egg yolks and water in center of mixture and mix with hands to incorporate.
Knead dough 5 to 6 times on floured surface. Form into disc. Cover with plastic and chill for 30 minutes.
Roll out and cut into four 5 1/2” circles. I used a mason jar lid.
Press into tart pans, fork indentations, and chill for 30 minutes.
Line with parchment paper (with some overlap), and place beans or pie weights in each tart.
Bake at 350 for 12 minutes. Remove parchment and bake for another 5 minutes, until edges begin to brown. Cool completely.