Put all the ingredients for the yeast dough in a bowl and mix w/ a handheld electric mixer undtil well combined.
Knead w/ your hands - knead thoroughly & form a ball.
Cover the bowl w/ a tea towel & put the bowl in the oven. Heat the oven up for 2-3 min (at about 50° C) - then stop heating & leave the yeast dough alone. Let it chill in the cosy warmth for about 60 min.
In the meantime pluck some oregano leaves & mince them. You need about ½ - 1 tbsp minced oregano.
Mix the tomato pulp, the olive oil & the minced oregano; add salt & pepper to taste. Set aside.
Cut the buffalo mozzarella into thin slices. Set aside.
Grate the pecorino or rely on some grated leftovers in your fridge from the last Italian pasta dish. Set aside.
Clean & trim the arugula. Chop the arugula roughly, however, leave some arugula for decoration. Set aside.
After about 60 min the yeast dough ball has - at least - doubled its size. Knead into a flat disk & roll out on baking parchment into a almost round or more oval pizza crust.
Put the mess on a baking tray & return it to the warm oven for about 20-30 min. The dough will rise a little & get totally fluffy.
Preheat the oven to 250° C after having removed the pizza crust.
Add about 50% up to 75% of the tomato pulp mess & distribute evenly.
Add the grated pecorino resp. parmesan & distribute evenly.
Add the chopped arugula & distribute evenly.
Add the slices of buffalo mozzarella & distribute evenly.
Put the pizza into the preheated oven & reduce the temparature to 175° C fan on.
Bake for about 20 min.
Scatter the last of the arugula all over the pizza.