Pappardelle with Sausage and Caramelized Onion Ragu - Where The Food Comes From

Ingredients

• 12 ounces mild or hot bulk Italian sausage, (Note: You may use links with the casings removed. )
• 2 tablespoons butter
• 2 large yellow onions, (quartered and thinly sliced)
• 2 large garlic cloves, (minced)
• ½ teaspoon crushed red pepper flakes, (optional)
• ½ cup cream sherry
• 1 cup chicken broth
• 1 - 28 ounce can whole San Marzano tomatoes, (drained and chopped, juice reserved)
• 1 tablespoon fresh thyme leaves
• Kosher salt and freshly ground black pepper, (to taste)
• ¼ cup finely grated Parmigiano-Reggiano cheese
• ¼ cup loosely packed fresh basil leaves, (torn)
• 1 pound pappardelle pasta,