Preheat the oven to 450 °F (230 °C). Bring the water, seasoned with 1 teaspoon (5 ml) of the salt, to a boil in a large saucepan. Add the potatoes. Boil for 7 to 8 minutes, or until fork tender.
Remove the potatoes with a slotted spoon and transfer to a mixing bowl. Add the butter, the remaining 1/4 teaspoon (1 ml) salt, the cinnamon, nutmeg, Barbados, pepper, pecans and syrup and mash.
Pour into a casserole. Sprinkle the top with the Plantation Raw Sugar and the marshmallows. Bake for about 20 minutes, or until the marshmallows melt and turn light brown. Serve hot.