Soften onion in butter. Add Arborio rice and stir over medium heat to toast the rice. Add warm stock ½ cup at a time, stirring often, waiting until the liquid is almost fully absorbed before adding the next cup.
When the rice is tender, stop adding the stock. Fold in beet puree, crème fraîche, Parmesan, and chives. Stir vigorously to incorporate. Add a little more stock if the risotto is too thick. The consistency should be saucy. Add salt to taste.
Divide the risotto between 4 plates. Sprinkle with roasted beet cubes, chèvre, toasted pistachios, lemon zest, and baby beet greens. Serve.
Bull's Blood Beet Purée
Thinly slice beets. Spread in an even layer in a tall sauté pan.
Add vinegar, enough water to cover beets, sugar, and salt.
Cover with a piece of parchment paper and cook over medium heat until the beets are soft and the liquid has reduced to a glaze. If the liquid evaporates before the beets are cooked add a little more water and cook longer.
Puree beets in a blender with the cream. Check seasoning.
Yield: 2 cups