Start by preparing the batter. Combine the flour and salt in a bowl. Stir and pour in the water a little at a time, working with electric whips at full speed. Cover with plastic wrap and refrigerate for 3 hours.
Cook the eggs sunny-side up with a knob of butter. Season with salt and pepper.
Proceed to prepare the galette. Take the batter and mix well.
Heat the crepe pan and add a knob of butter, and then pour in a ladleful of batter and spread quickly. Cook until the surface is cooked.
Stuff the center of the galette with the egg, 2 slices of cooked ham, and Gorgonzola Pdo. Fold the 4 flaps inward and continue baking until crispy.
Serve the galette, garnishing it with fresh baby spinach and sliced spring onions.