• 1/4 c. grated Parmigiano-Reggiano
Bring 5 cups water to a boil in a medium pot over high heat. Reduce heat to low, add bouillon cube, and stir until dissolved.
Heat oil in a medium heavy pot over medium-low heat. Add onions and garlic and cook, stirring often with a wooden spoon, until soft, about 10 minutes. Increase heat to medium-high, add shrimp and cook for 1 minute.
Add rice, stir to coat well, then add wine and cook until alcohol evaporates, about 3 minutes. Add 1/3 cup warm broth at a time and cook, stirring constantly, until broth has been absorbed before adding more. After 15 minutes, add radicchio. Continue cooking until rice is tender but firm, about 5 minutes more. Remove from heat, stir in Parmigiano-Reggiano, and season to taste with salt.