In a bowl, add the flour and make a well in the center. Pour in the olive oil, sugar, and yeast.

Add the warm water and mix with a fork until the yeast is completely dissolved.

Add the salt and a little more water as needed, mixing until you have a soft, slightly sticky dough.

Cover and let rest for 1 hour in a warm place.

Grease a baking pan with olive oil. Spread the dough evenly in the pan and arrange the tomatoes on top.

At this point, you can either let the focaccia rest in the pan for another hour, or proceed directly to the next step.

Make an emulsion by mixing olive oil and water in a glass. Stir well and pour it over the focaccia.

Sprinkle with sesame seeds and bake at 350–400°F (180–200°C) until golden brown! Enjoy it warm—it's delicious!