Pasta with Broccolini, Sausage, + Lemon

Ingredients

• 2 tablespoons extra virgin olive oil
• 1 lb fresh Italian sausage - I do half spicy half mild (see notes in Riffs)
• 1 lb broccolini/baby broccoli/ broccoli rabe
• 1/2 medium yellow onion, diced
• 3 cloves garlic diced
• 1 lb orecchiette pasta
• zest of 1 small lemon, about 2.5 teaspoons
• juice of 1/2 small lemon plus more if desired
• 3/4 cups grated Parmesan cheese, plus more for serving
• up to 2 cups of pasta cooking water
• kosher salt
• cracked black pepper
• optional: toasted breadcrumbs for serving