Scallion Crostatas

Name: Scallion Crostatas
Ingredients: Pie dough; 1/2 cup cold water; 2 tablespoons rice vinegar; 1/2 cup ice cubes; 1 1/4 cups all-purpose flour (160 grams); 1 teaspoon sugar; 1/2 teaspoon kosher salt; 1/2 cup unsalted butter (113 grams), cut into tablespoons, very cold; 1 teaspoon sesame oil; 1 large egg, beaten with a splash of water; Scallion filling; 4 teaspoons soy sauce; 4 teaspoons sesame oil; 1 tablespoon brown sugar; 1 pinch red pepper flakes; 24 scallions, white and green parts thinly sliced (about 3 cups)