Roasted Sausage with Broccoli and Fennel

Name: Roasted Sausage with Broccoli and Fennel
Ingredients: 12 ounces (about 3 or 4 links) good-quality pork sausage, removed from casings and cut into 3/4-inch pieces; 2 small heads of broccoli, cut into small florets; 1 medium fennel bulb, trimmed, cored, and cut into thin slices, about 1/4-inch thick; Kosher salt and freshly ground pepper; 3 tablespoons olive oil; 2 teaspoons whole-grain mustard; Finely grated zest and one 1 teaspoon of juice from 1 small lemon; 1/2 teaspoon Aleppo pepper, or a lesser amount of red pepper flakes or cayenne (omit if you're using spicy sausage)