Add coconut milk, sweet potato, cumin, coriander, turmeric, thyme, allspice, fenugreek, pepper, cinnamon and cayenne. Stir a few times, raise heat and bring to a simmer. Lower heat and allow to cook until sweet potatoes are tender, about 20 minutes. Stir in chickpeas and peas. Allow to cook just until heated throughout, 1-2 minutes more. Season with salt to taste.