Peel and finely chop the onion. Heat a tablespoon of oil in a pot and fry the onion until transparent. Add rice and fry. Add chunky tomatoes, bring to the boil, season with some stock and let it swell for 20 minutes at low heat.
Add peas five minutes before the end of the cooking time. Wash the cucumber and grate coarsely. Peel garlic and press it through a garlic press or chop it very finely. Stir quark until smooth. Fold in cucumber and garlic.
Season to taste with salt, pepper and a little vinegar. Heat the remaining oil in a coated pan and fry the pork gyros in it while turning. Season the rice with salt, pepper and paprika. Press into a cup as desired.
Arrange rice overturned with tzatsiki and gyros on a plate. Garnish with parsley.