Sweet Potato Satay Curry - A better choice!

Ingredients

• 1 tbsp coriander seeds
• 4 long red chillies
• 2cm cube ginger, peeled
• 1 tbsp ground paprika
• 4 garlic cloves
• 2 limes, zest and juice
• 2 stalks fresh lemongrass, white part only
• 50g peanut oil
• 1 tbsp oil
• 1 large brown onion, chopped
• 3 garlic cloves, minced
• 2cm cube ginger, peeled and chopped finely
• 3 tbsp red thai curry paste (homemade as above or store bought)
• 1 tbsp smooth peanut butter
• 500g sweet potato, peeled and cut into chunks
• 400ml can coconut milk
• 200ml water
• 150g spinach
• Cooked rice, to serve
• 1 lime, juiced (optional)
• Salt & pepper, to taste
• ½ cup peanuts, chopped (optional)