Big Batch Sweet Potato Curry

Ingredients (Serves 6)

• 1 tsp 1 tsp cumin seeds
• 1 tsp 1 tsp mustard seeds
• 1 tsp 1 tsp garam masala
• 1 tsp 1 tsp coriander seeds
• 50 g 1.8 oz gingerroughly chopped
• 600 g 21.2 oz sweet potatoes3cm cubed
• 400 g 14.1 oz white mushroomsliced
• 300 g 10.6 oz spring greenssliced
• 2 tbsp 2 tbsp tomato puree
• 1 tbsp 1 tbsp tamarind pasteoptional
• 2 tbsp 2 tbsp gheeor coconut oil
• 4 4 cardamom podscrushed
• 1 1 white onionsliced
• 2 2 chopped tomatoes (can)