Put oven rack in middle position and preheat oven to 425°F.
Tightly wrap beets foil and roast on a baking sheet until tender, about 1 1/2 hours. Let cool slightly. Peel the beets under running cold water. Place two of the beets in a blender or food processor and process briefly, until somewhat smooth. Dice the remaining beet into 1/2 inch cubes.
While beets are cooling, bring broth and water to a simmer in a 2- to 3-quart saucepan.
Heat butter in a wide, heavy pot over moderate heat. Cook the garlic and onion until softened and fragrant. Add the rice and cook, stirring constantly, for 1 minute.
Add wine and stir until absorbed, about 1 minute. Using a ladle, stir in 1/2 cup warm broth and simmer briskly, stirring constantly, until broth is absorbed. Continue simmering and adding warm broth, one ladle at a time, stirring constantly and letting each addition be absorbed before adding the next, until rice is just tender and creamy-looking, 18 to 22 minutes.
Stir in beets, beet puree, vinegar, salt, and pepper and cook, stirring, until heated through.
Top bowls of risotto with crumbled goat cheese and dill. Serve immediately.
Video
Notes
Tips
Keep the broth on a low simmer in the saucepan so the temperature stays consistent each time you add more broth to the rice.
I usually have white vermouth on hand to use instead of white wine. It keeps indefinitely and saves the white wine for sipping while you indulge in the risotto.
To check for doneness, taste the risotto. It should become very creamy during the last five minutes but shouldn’t be mushy.
Ifyour risotto is too thick, stir in a splash of broth at a time to loosen it up.
How to store and reheat
To store: Keep any leftover risotto in an airtight container in the fridge for up to 3 days.
To reheat: Place the leftovers into a pan with a bit of extra broth and heat over medium heat until warmed through.