Preheat the oven to 425ºF and line a baking sheet with parchment paper.
Add the asparagus spears and carrots to the sheet pan and drizzle with olive oil. Toss gently to coat the vegetables.
Sprinkle on the kosher salt and black pepper, as well as any optional seasonings.
Place the sheet pan in the oven and roast for 18-22 minutes, or until both the asparagus and carrots are tender, yet still bright in color.
Remove from the oven and add the freshly squeezed lemon juice, tossing to coat. Garnish with lemon zest (if desired).
Sprinkle on the grated parmesan cheese (if using) and serve immediately.
Optional seasonings: The beauty of this recipe is how simple it is, but feel free to add some of your favorite seasonings. Good options include parsley, thyme, dill, sage, and chervil.
Carrot and asparagus size: Choose thin, tender asparagus spears. Remove the woody part, which naturally breaks when you bend the spear. Choose thin, small carrots - fresh and in season if available. Cut the carrots into thin spears similar in size to the asparagus. This is essential and will allow them to cook evenly and at the same rate.
Serving: 1cup | Calories: 133kcal | Carbohydrates: 13g | Protein: 4g | Fat: 8g | Saturated Fat: 2g | Polyunsaturated Fat: 1g | Monounsaturated Fat: 5g | Cholesterol: 3mg | Sodium: 701mg | Potassium: 485mg | Fiber: 5g | Sugar: 6g | Vitamin A: 13414IU | Vitamin C: 14mg | Calcium: 87mg | Iron: 3mg