Preheat the oven to 400 degrees F. Toss the carrots, onion and ginger with 2 tablespoons of oil, 1 teaspoon salt and a few grinds of pepper on a baking sheet. Roast until the vegetables are tender and lightly browned, about 20 minutes.
Meanwhile, heat the chicken broth with 3 cups water in a medium saucepan over medium heat. Keep it just under a simmer. Heat the remaining 2 tablespoons oil in another medium saucepan over medium heat. Add the rice and cook, stirring, until the rice is translucent, about 1 minute. Add the wine and simmer, stirring, until the wine is fully absorbed, about 2 minutes. Add the thyme sprigs and season with 1/2 teaspoon salt and a few grinds of pepper. Add about 1/2 cup warm broth. Cook, stirring, until the broth is almost absorbed. Continue adding broth, 1/2 cup at a time, and stirring until all of the broth has been incorporated and the rice is tender, but not mushy, about 25 minutes total. Stir in the butter, a few cubes at a time, until melted and the risotto is creamy.
Roughly chop half of the roasted vegetables and stir them into the risotto. Spoon into bowls and garnish with the remaining vegetables and fresh thyme if using.
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