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Combine the warm water, dried yeast and caster sugar in the bowl of an electric mixer fitted with a dough hook. Mix to combine. Add the plain flour, salt and mix to incorporate all the flour. You should have a sticky dough.
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Grease a tray with olive oil and dust with a little semolina. Using a spatula, scrape the dough into the oiled tray. Rub the dough with a little oil and set aside to rise for about 30 minutes. After this, stretch the dough from underneath to fill the prepared tray. Allow it to rise for a second time, again for about 30 minutes.
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Preheat your oven to 240C. Drizzle over a little more oil and use your finger tips to make some indents in the dough. Then add your slices of tomato and onion, plus some rosemary leaves and dried Greek oregano. Drizzle over some more oil. Season generously with sea salt and bake until golden (about 15 minutes). As you take the tray out of the oven add another drizzle of oil (yes, more!) and then let the bread rest in the tray for about 20 minutes, then serve.