In a large soup pot over medium heat melt 1 tablespoon of the butter. Add the diced chicken and season generously with salt and pepper. Saute for 3 to 4 minutes or until just cooked through. Transfer chicken to a small bowl. Add the remaining butter to the same pan and saute the onion until lightly browned, about 5 minutes. Add the garlic, ginger, and all three spices and saute for one minute more. Next, add the chicken broth to deglaze the pan, stirring to pick up any browned bits. Add the diced sweet potatoes to the liquid, cover, and bring to a boil. Once boiling, uncover and reduce to a simmer, cooking for 6 – 8 minutes or until sweet potatoes are tender. Add the diced pears and continue to simmer for 5 minutes more. Stir in the coconut milk and season the soup to taste with more salt and pepper if necessary. Divide the soup between bowls and garnish each with the toasted coconut and cilantro.