Sausage and Sweet Potato Pasta

Bahan-bahan (4 porsi)

• 1 pound Italian sausage links (hot or mild, casings removed)
• 1 pound sweet potatoes
• 1 red bell pepper
• ½ red onion (slivered)
• 4 cloves garlic (minced)
• 2 tablespoon olive oil
• ½ teaspoon dried basil
• ½ teaspoon Kosher salt (or to taste)
• ¼ teaspoon black pepper (or to taste)
• 8 ounces rigatoni (or other medium pasta shape)
• 1 cup packed arugula (or spinach leaves, *see note)
• ½ cup shredded Parmesan cheese
• 1 teaspoon lemon zest
• ¼ teaspoon red pepper flakes