Braised tofu with sour yoghurt and spinach | Umami

Ingredients

• 75ml vegetable oil
• 1 x 280g block firm tofu, cut into 3cm cubes and patted dry
• Fine sea salt and black pepper
• 1 onion, peeled and finely sliced (150g)
• 4 garlic cloves, peeled and crushed
• 220g plain yoghurt
• 1 tbsp lime juice
• 30g walnuts
• 1 tsp cumin seeds
• 1 tsp black mustard seeds
• 2 tsp hot madras curry powder
• ¼ tsp ground turmeric
• 1 tsp caster sugar (or granulated)
• 50g spinach leaves
• 50g frozen peas