In a large bowl place flour and salt.
In a small bowl place the warm water (the water should be between 100°F-110°F)). Add the yeast and sugar, stir lightly and let it sit until frothy. This will take about 5-10 minutes.
Add the yeast mixture to the flour and blend well until a soft dough forms. I like to use my hands but a dough hook on a stand mixer will work fine too.
Place inside a bowl that has been rubbed with a little of the olive oil. Cover and let it sit until double in size. Save the remaining olive oil for the egg wash.
Preheat oven to 400°F.
Turn dough onto a floured surface. Punch down and knead for about 5 minutes.
Mix beaten egg, water and remaining olive oil to make an egg wash. Stir and place in fridge until ready to use.
Roll dough into a ball and divide into 4 equal parts.
Using a rolling pin roll out into 12" x 3" oval shape. It will be thin.
Place filling down the center of the oval.
Pinch the top and bottom of the oval to create a boat shape, and fold sides inwards.
Brush with egg wash and sprinkle with nigella seeds.
Place individual pide on a baking sheet that has been sprinkled with cornmeal.
Bake for about 12-15 minutes, or until pide appears golden and crispy.