To make the dough, arrange the flour on a counter, add a little salt, oil and the yeast dissolved with a little warm water. Knead the dough with your hands vigorously, adding warm water if necessary, for 10-15 minutes. You will get a soft, compact dough. Let stand about 2 hours, covering it with a cloth.
In a bowl put the tomato sauce, garlic and oregano. Mix everything and put aside.
Sprinkle some flour over the counter and roll out the dough. Stretch the dough on a baking tray, poke with a fork and, spread a little tomato sauce and cheese over it.
Bake the dough at 250°C for 10-15 minutes and, once slightly brown, remove from the oven. Finally, put the Serrano ham and fresh arugula on top.