Knead the flour, vegetable oil, water, and salt until a smooth dough is formed. Divide the dough into two even portions, and roll each portion out to form a large circle.
For the filling, mix the spinach, ricotta, one egg, parmesan, salt and pepper together in a bowl. Add this mixture to one of the dough halves in the following manner: a large portion in the center, with the rest forming a ring around the center portion. Make sure there is a bit of distance between the outer ring and the center.
In and around the spinach filling, brush the dough with your second egg. Carefully place the other circle of dough on top and cut away any excess dough to form a perfect circle. With a fork, press the edges so that the two dough halves are secured together. This also creates a decorative pattern!
Now make evenly distributed cuts into the outer spinach ring. Turn each piece onto its side, so that the spinach filling is visible.
Finally, brush the starburst with egg, and bake for 60 minutes at 340°F.