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Heat some oil in a large frying pan. Add the meatballs and fry until golden brown on all sides. Put on a lid or cover with tin foil and cook for another couple minutes until cooked through.
For the tzatziki: Slice the cucumber in half lengthwise and scrape out the core with a spoon. Grate the cucumber and then squeeze out any excess moisture before transferring to a bowl. Add the yoghurt, sour cream if using and mint and stir to combine. Season with salt and pepper.
To serve, toast the pittas. Cut in half and fill with the meatballs, rocket, tomatoes and tzatziki.