Warm 50 ml water with sugar until lukewarm. Dissolve yeast in it. Put the flour in a bowl and press a depression into it. Add yeast mixture and dust with flour. Cover and leave to rise in a warm place for about 5 minutes until the flour shows cracks.
In the meantime press the potatoes through a potato press, add 75 ml water, oil and salt to the pre-dough and knead to a smooth dough. Cover and leave to rise in a warm place for about 30 minutes. Drain the mozzarella and then cut it into slices about 3 mm thick. Wash and clean the tomato and cut into approx. 5 mm thick slices. Season chunky tomatoes with salt and pepper. Roll out the dough on a floured work surface to a round (20-25 cm Ø) thickness of approx. 5 mm. Place on a baking tray lined with baking paper and spread with the chunky tomatoes. Spread slices of tomato, mozzarella cheese and olives on top. Bake in the preheated oven (electric: 225 ° C/ gas: level 4) on the lower rack 15-20. Wash the basil, dab dry and remove the leaves.
Roll out the dough on a floured work surface to a round (20-25 cm Ø) thickness of approx. 5 mm. Place on a baking tray lined with baking paper and spread with the chunky tomatoes. Spread slices of tomato, mozzarella cheese and olives on top. Bake in the preheated oven (electric: 225 ° C/ gas: level 4) on the lower rack 15-20. Wash the basil, dab dry and remove the leaves. Take the pizza out of the oven, cover with Parma ham and basil. Serve immediately