Stir-fried mushrooms & spinach with golden onions

INGREDIENTS

• 3 tbsp sunflower oil
• ½ tsp cumin seeds
• 2 medium onions , chop one and thinly slice the other
• 250g pack chestnut mushrooms , quartered
• ½ tsp garam masala
• ½ tsp garlic paste or 1 crushed garlic clove
• 1 tbsp finely chopped fresh root ginger
• 1 small green chilli , seeded and chopped
• 4 x 250g bags ready washed young leaf spinach
• ½ tsp turmeric