For the bread: Add the water, salt, sugar and yeast to the bowl of a stand mixer fitted with the dough hook. Stir until the sugar has dissolved and leave to stand for 10 minutes. Add the bread flour and mix on low speed to form a dough. Turn the speed up to medium and mix/knead for 5 minutes. You will be left with a soft but slightly sticky dough. Place the dough in a clean, oiled bowl, cover with a clean tea towel and leave to rise for 1-2 hours or until doubled in size. Preheat your oven to 240℃ and line a baking sheet with baking paper. Dust a work surface with flour and divide the dough into 6 equal portions. Roll the dough into a 10cm diameter circle with a rolling pin. Place the dough rounds on the baking sheet and brush all over with olive oil. Top the dough with some of the spinach, mozzarella, tomato and red onion, leaving a 1cm border on the outside edge. Scatter the border of the dough round with sesame seeds and break an egg in the centre. Bake in the oven for 13 minutes. Serve warm.
Preheat your oven to 180℃. Arrange the sourdough slices on a baking sheet, drizzle with olive oil and toast in the oven. Turn on the grill of your oven. Spoon some marinara sauce on each slice of toast, followed by 60ml of grated mozzarella and a few slices of salami. Sprinkle some dried oregano over and place under the grill until the cheese is melted and bubbly. Remove from the oven, top with fresh basil leaves and serve immediately.