fresh yeast or 2 1/2 tsp active dry yeast (10 g) • water (about 125 g), adjust as needed for the dough • sugar • all-purpose flour (about 500 g) • salt • egg • Oil for frying • tuna, 9 oz (250 g) • Pitted black olives • cooked and peeled potatoes • hard-boiled eggs • sprigs of fresh parsley •