In a medium bowl, stir together flour, salt, and boiling water until a dough forms. Knead for 4-5 minutes. Wrap in plastic and set aside while you make the filling.

Heat oil in a large skillet over medium heat. Add vegetables, soy sauce, and harissa, and cook, stirring often, until everything is tender and most of the liquid has evaporated, about 5 minutes. Transfer to a bowl and let cool.

Divide the dough into 12 equal pieces. On a floured surface, roll each piece into a circle about 3 inches in diameter. Place a tablespoon of vegetable mix in the center and fold up and seal the dough around it. Repeat with remaining pieces of dough.

Heat a tablespoon of oil in a large skillet over medium-high heat. Arrange potstickers in pan, but do not move them. Let fry for 2 minutes.

Add 1/4 to 1/3 cup of water and immediately cover skillet. Reduce heat to medium and steam for 7 to 8 minutes or until water is evaporated.