Carrot and Potato Tagine with Peas

Ingredients

• 1 tablespoon butter or ghee
• 2 onions, (halved and sliced with the grain)
• 4 garlic cloves, (chopped)
• a thumb-sized piece of fresh ginger, (peeled and chopped)
• 1 red chillies/chiles, (deseeded and finely chopped)
• 1 teaspoon cumin seeds
• 1 teaspoon coriander seeds
• 2 teaspoons ground turmeric
• 8 small potatoes, (peeled and left whole)
• 3 carrots, (peeled and cut into 3–4 chunks)
• 2 1/2 cups vegetable stock
• 1 1/2 cups freshly shelled or frozen peas
• a small bunch of fresh flat-leaf parsley, (finely chopped)
• a small bunch of fresh mint, (finely chopped)
• sea salt
• freshly ground black pepper