| 12 ounces spaghetti | |
| Kosher salt | |
| 1/4 cup extra virgin olive oil | |
| 6 large garlic cloves, minced | |
| 1/2 teaspoon crushed red pepper flakes, plus more to taste | |
| Zest of 2 lemons | |
| Juice of 1 lemon | |
| 1/2 cup fresh parsley, chopped | |
| Black pepper | |
| 1/4 cup grated Parmesan cheese (optional), plus more to taste |