Spaghetti Alla Carbonara

INGREDIENTS

• Coarse salt and freshly ground pepper
• 1 pound spaghetti
• 1 tablespoon extra-virgin olive oil
• 6 ounces slab bacon or pancetta, cut into 1/4-inch pieces
• 3 cloves garlic, minced
• 4 large egg yolks
• 1/2 cup heavy cream
• 1/2 cup grated Parmesan cheese, plus more for garnish if desired
• Zest of 1 lemon (optional)
• 1/4 cup chopped flat-leaf parsley