Best Baked Cod In Foil With Vegetables and Chimichurri Sauce

Name: Best Baked Cod In Foil With Vegetables and Chimichurri Sauce
Ingredients: 1 pound cod fillets (frozen or fresh, see notes); 2-3 medium lemon; 1 cup bell pepper (roughly chopped); ½ cup red onion (roughly chopped); 1 cup carrot (thinly sliced); 3 cups potatoes (thinly slices); 3-4 tablespoons vegetable oil; 4 teaspoons dried herbs (such as Herbs de Provence); unsalted or salted butter (optional, 1 tablespoon per fillet); kosher salt or sea salt (for most natural flavor); black pepper to taste; 3 teaspoons garlic (optional) (freshly minced, see notes)