Preheat the oven to 180°C/356° F with both upper and lower heating elements.
For the dough:
Pour the water, olive oil, yeast and sugar into a mixing bowl. Mix with a hand whisk and let the yeast activate for 5 minutes.
Add the flour and salt and knead with a hook attachment for 5-6 minutes until dough is smooth and pliable and comes away from the side of the bowl.
Transfer the dough to an oiled bowl. Cover with transparent film or a kitchen towel and leave for 1 hour at room temperature until it doubles in volume.
Once the dough has risen, grease a shallow rectangular baking tray 35x30 cm (12x14 inches). Transfer the dough and spread it evenly to the edges, pressing it slightly with your hands.
For the topping:
Spread the tomato paste over the dough, then add the tomatoes and onions. Sprinkle with a bit of oregano, drizzle over a little olive oil, and season with salt and pepper.
Bake for 30-35 minutes until golden.
Unmold the Ladenia, sprinkle with basil leaves and fresh oregano, cut into pieces, and serve.
Notes
Chef’s tip: Instead of tomato paste, pizza sauce can be substituted. Once the Ladenia is cooked, feel free to add any desired vegetables on top.