Crispy mushroom shawarma

Name: Crispy mushroom shawarma
Cook time: 1 h
Total time: 1 h
Cuisine: Greek
Ingredients: 200g natural yoghurt; 800g portobello and oyster mushrooms; 1 red onion; 2 cloves of garlic; 2 preserved lemons; 1 teaspoon ground cumin; 1 teaspoon ground allspice; 1 teaspoon smoked paprika; olive oil; 2 tablespoons pomegranate molasses; 10 radishes, ideally with leaves; ½ a cucumber; 100g ripe cherry tomatoes; 1 tablespoon white wine vinegar; 1 x 200g jar of pickled jalapeño chillies; 1 bunch of fresh mint (30g); 4 large flatbreads; 4 tablespoons tahini; 2 tablespoons dukkah