To make the basic tomato topping, mix the passatta, tomato paste, garlic, sugar together, and add seasoning. Spread the tomato mixture over the top of the pizza base leaving a 2cm gap around the edge. It is now ready for its topping.
Cut the ciabatta in half lengthways and top one half with the tomato base.
Dry the drained crab meat on kitchen paper and tip into a bowl. Stir in the lemon juice and zest, dill, capers and seasoning. Spoon on top of the tomato base. Sprinkle with cheese and dust with paprika.
Bake in preheated oven at 200 degrees celsius for about 10 mins until bread is crispy and golden brown.