For the crust, mix together the warm water, salt, dry
yeast and vegetable oil. Slowly add flour; knead. Divide into 3 parts. Brush with oil and cover. Let rest until filling is ready.
Filling:
Roll dough to a large rectangle; layer 4 slices of American cheese down middle of the dough, overlapping.
Next layer ham, then salami (brushed with mustard), 1/3 of sausage or hamburger and 1/2 cup Mozzarella cheese (onion and green pepper if desired).
Fold over sides and ends; seal. Brush top with oil. Sprinkle with oregano.
Repeat with other 2 pieces of dough. Bake at 500 degrees for 15 minutes.