Combine all ingredients in the specified order. You can use a stand mixer, bread-maker, or mix by hand. If using a bread-maker, select the dough setting, allowing it to knead and rise.
Alternatively, for manual kneading, gradually add water and oil to the dry ingredients. Let the dough rest and rise for 30-60 minutes, covered with cling film and a towel at room temperature.
Preheat the oven to its highest setting. Place a pizza stone in the oven, or use a baking tray dusted with flour or corn flour.
Once the dough is ready, knock the dough back by kneading it briefly, then divide into 2 balls. Cover again and leave to prove again for 1 hour.
Roll and stretch each ball of dough into 25-30 cm rounds to make 2 pizza bases.
Transfer one pizza to the pizza stone or baking tray and add your toppings: tomato sauce, tuna, red onion, sweet corn, and cheese.
Bake for 8 to 10 minutes or until golden and crisp.
Repeat the process with the remaining portion of dough.
Enjoy your homemade tuna pizza.