Pasta with Salumi Bolognese

Ingredients

• 4 ounces mixed salumi (such as soppressata or finocchiona), chopped
• 1 tbsp extra virgin olive oil, plus more as needed
• 2 ounces country ham or prosciutto ends, cut into small cubes
• 8 ounces ground beef chuck
• 1 ounce guanciale or pancetta, cut into small cubes
• 2 tbsp fennel seed
• 1 large pinch chile flakes
• 1/2 cup diced carrots
• 1/2 cup diced celery
• 1 cup diced onion
• 1/2 cup (1 6-ounce can) tomato paste
• 2 cups dry red wine
• 1 (28-ounce) can tomatoes (whole, peeled), crushed by hand
• 1 tbsp dried oregano, plus more for garnish
• 2 cups chicken stock
• 4 tbsp butter, cubed
• 2 tbsp red wine vinegar
• 2 pounds dried spaghetti
• Chopped fresh parsley
• Fresh ricotta (optional)