To prepare the dough, mix the dried ingredients in a mixing bowl. Add oil and then add water slowly and mix it with a fork. Do not use all the water if its not needed.
2)Knead the dough well for 10 minutes.
Keep dough aside and cover it with a kitchen towel. Keep it for 3 hrs and the dough will be double the size. Kneed it again. Dough is ready.
Preheat the oven at 450f(225ªC).
Grease baking sheet(regular baking sheet) with olive oil and spread the dough on it with hand or rolling pin.
In another pan, simultaneously saute the onion in olive oil and spread on the pizza. Once when the bread is almost cooked, drain the oil/water from tuna fish and spread it on pizza. Bake for another 10-15 minutes. Tuna fish pizza is ready.