Preheat the oven to 400°F, 200°C, or gas mark 6. In a saucepan bring the vegetable broth to a boil.
4 cups vegetable stock
Slice the carrots and leek in half lengthwise. Run the leek, cut side opened, under water to clean away the dirt. Slice off the roots at the bottom of the leek.
2 carrots, 1 leek
Place the carrots and leek on the sheet pan and drizzle 1 tablespoon oil to cover the vegetables. Place the carrots and leek, cut side down and place into the oven. Cook for 20 minutes.
2 tablespoons olive oil
Once the vegetable stock starts boiling, reduce to a simmer. Meanwhile heat a large skillet or casserole pan over medium-high heat, heat the remaining olive oil and arborio rice. Stir until rice becomes fragrant, add the garlic and cook for another 30 seconds, Then, add the white wine. Cook until it is absorbed.
1 cup white wine, 1 cup arborio rice, 2 tablespoons olive oil, 1 tablespoon garlic
Reduce the heat to medium and using a ladle add one ladle full of vegetable stock. Stir to mix evenly and cook until the liquid is almost absorbed, about 3-5 minutes, stirring frequently. Add the thyme and repeat until all but a ladle full of vegetable broth remains. Remove from the heat.
4 cups vegetable stock, 1 tablespoon thyme
Take the carrots and leeks out of the oven and slice them. Add them to the risotto along with the remaining broth, pepper and parmesan cheese. Stir to combine and top with additional parmesan cheese if desired.
2 carrots, ¼ cup Parmesan cheese, ½ teaspoon pepper, 1 leek