Vegan Tikka Masala

Name: Vegan Tikka Masala
Prep time: 10 min
Cook time: 1 h
Total time: 1 h 10 min
Cuisine: Indian
Ingredients: 8 King oyster mushrooms; 2 tbsp vegetable oil; 1 large brown onion, finely diced; 1 tbsp garam masala; 2 tsp ground coriander; 1 tsp turmeric; 1½ tsp ground cumin; ½ tsp ground cardamom; 2 tsp paprika; ½ tsp nutmeg; 1 tbsp nutritional yeast; 5 garlic cloves, minced; 1 tbsp finely grated fresh ginger; 400 g / 14 oz can chickpeas, drained; 1½ cups tomato passata; 1 tbsp tomato paste; 1 cup coconut milk; 1 cup vegetable stock; 1 cup water; 1 tsp sea salt; 1-2 cups baby spinach; 1 to 2 tbsp vegan buttery spread; naan bread or papadums to serve; 3 cups cooked basmati rice to serve