To make the dough, dissolve the yeast, salt, and sugar in the water in a bowl.

In another bowl, add the flour and oil, and mix well. Pour in the water mixture and knead until a smooth dough forms. Let the dough rest for 1 hour.

To make the filling, combine the ground beef, black pepper, salt, seven spice, and oil in a bowl and mix well. Add the onion, parsley, tomatoes, and green bell pepper to the meat and mix thoroughly.

Roll out the dough and cut it into pieces. Use a rolling pin to flatten each piece to about 1/4 inch (1/2 cm) thick. Place the filling on top, arrange the pies on a baking sheet, and bake in a preheated oven at 400°F (200°C) until cooked through.

Remove from the oven, place the lahm bi ajeen on a large serving plate, and serve hot.