Candied Sweet Potatoes

Ingredients

• 8 tablespoons (1 stick) plus 1 tablespoon unsalted butter
• 1/2 cup packed light brown sugar
• 1/4 cup heavy cream
• 2 tablespoons cane syrup or molasses
• 1 teaspoon ground cinnamon
• 1/2 teaspoon salt
• 1/4 teaspoon freshly grated nutmeg
• 1/4 teaspoon ground ginger
• 1/8 teaspoon ground allspice
• 4 pounds sweet potatoes, peeled and cut into
• 1/4-inch-thick slices on a mandoline
• 2 1/2 cups mini-marshmallows
• 1 cup pecans, toasted, and roughly chopped (see note)