Make the dough: In the bowl of a food processor, combine flour, salt, and sugar. Add butter, and process until the mixture resembles coarse meal, 8 to 10 seconds.With machine running, add ice water in a slow, steady stream through feed tube. Pulse until dough holds together without being wet or sticky; be careful not to process more than 30 seconds. To test, squeeze a small amount together: If it is crumbly, add more ice water, 1 tablespoon at a time. Divide dough into two equal balls. Flatten each ball into a disc and wrap in plastic. Transfer to the refrigerator and chill at least 1 hour. Dough may be stored, frozen, up to 1 month.Prepare the pies: Combine the apricots, lemon juice, sugar, salt, cinnamon and coriander in a small bowl and gently stir to combine. Put in the refrigerator while you prepare the dough.Take out one disk of pie dough and place on flour-dusted surface for a few minutes to slightly soften. Using a rolling pin, roll out the dough until it is between 1/4 and 1/2 inch thick. Use a 4 inch biscuit cutter to cut about 10 circles (you may need to gather the scraps and re-roll). Set them on a large plate and put them in the refrigerator to chill for 10 minutes (don’t skip this step-it will make the pies much easier to assemble).Prepare a baking pan with a sheet of parchment paper. Then, take apricots out of refrigerator, set a mesh strainer over a bowl, and pour the fruit into it, straining away the excess juice. Return the apricots to the original bowl and add the flour, tossing to coat.Preheat the oven to 375 F.Remove the dough circles from the refrigerator. Put a small spoonful of fruit onto one half of each circle of dough. Using your finger, brush a little cold water along the border of the circle (to help it seal) and fold the top half of the dough over the apricots, pressing the edges gently to seal. Make a decorative edge by pressing the edges of the dough together with the back of a fork. Repeat with remaining dough circles. Brush the tops with the egg wash. Bake for 30-35 minutes or until the tops begin to brown. Don’t worry if some of the filling leaks out. Allow the pies to cool for 15 minutes before eating.