Brussels Sprouts Gratin

Name: Brussels Sprouts Gratin
Ingredients: For the brussels sprouts:; 1 pound brussels sprouts; 1 cup low-sodium chicken broth or stock; 1/2 cup heavy cream; 1 tablespoon whole-grain mustard; 1 teaspoon maple syrup (grade B preferred); 1/2 teaspoon kosher salt; 1/4 teaspoon freshly ground black pepper; For the gratin topping:; 1 cup bread crumbs made from dry bread; 1/2 cup chopped pecans; 2 tablespoons unsalted butter, melted; 1 1/2 teaspoons (1/2 tablespoon) maple syrup (grade B preferred); 1/4 teaspoon kosher salt