Coconut Free Range Organic Chicken Soup

3 cupsĀ  free range organic chicken stock 1 fresh thumb-sized piece of ginger, sliced into thin coins 1 cup coconut milk 1 tablespoon fish sauce 2 teaspoons agave nectar 6 ounces leftover chicken 1 cup mushrooms, rinsed, drained and sliced in half lengthwise 1 medium...