Gyros with Pork and Tzatziki

Name: Gyros with Pork and Tzatziki
Ingredients: 800 grams lean Pork; 1 tablespoon Spice mix (for Gyros); 6 tablespoons Olive oil; Salt (and); freshly ground Pepper; 1 pinch sweet ground paprika; 200 grams Onion; 200 milliliters Beef broth; 1 tablespoon finely chopped Parsley; 3 Garlic cloves; 1 piece Cucumber (about 200 grams or about 7 oz); Salt; 150 grams Natural yogurt (from sheep's milk if available); 125 grams Quark; 1 tablespoon Olive oil; 1 tablespoon White vinegar; Thyme; 1 tablespoon finely chopped Dill tips; 2 tablespoons black Olives