Winter Weeknight Pasta

Ingredients

• 1 pound sweet and/or spicy Italian sausages (casings still on), cut into bite-size pieces
• 1 head cauliflower, separated into florets and cut into bite-size pieces
• 1 red onion, thickly sliced
• 1 tablespoon fennel seed
• 1/4 cup olive oil
• Kosher salt and freshly ground black pepper, to taste
• 1 pound fusilli (spiral-shaped pasta)
• 1 cup grated Parmesan cheese, plus more to taste
• 1 cup fresh Italian parsley leaves (left whole), for garnish, but also as an ingredient in its own right