French Onion Spaghetti

Ingredients

• Kosher salt
• 3 tablespoons extra-virgin olive oil
• 3 onions (about 1 1/2 pounds), sliced
• 4 shallots, thinly sliced
• Freshly ground pepper
• 1 tablespoon fresh thyme, chopped
• 1/4 cup dry vermouth
• 1 tablespoon sherry vinegar
• 1/2 cup low-sodium beef broth
• 12 ounces spaghetti
• 1/4 cup chopped fresh parsley
• 1 cup shredded Gruyère cheese (about 4 ounces), plus more for topping (optional)
• 1/2 cup shredded Parmesan cheese, plus more for topping

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