Sag aloo

INGREDIENTS

• 2 tbsp sunflower oil
• 1 onion , finely chopped
• 2 garlic cloves , sliced
• 1 tbsp chopped ginger
• 500g potatoes , cut into 2cm, ¾in chunks
• 1 large red chilli , halved, deseeded and finely sliced
• ½ tsp each black mustard seeds, cumin seeds, turmeric
• 250g spinach leaves