Prepare the ingredients - mince the garlic and chop the onion and radicchio.
Put the vegetable broth in a pot over high heat and bring to a boil. Turn it down to a simmer.
While the broth is heating, saute the onion and garlic in the olive oil and a pinch of salt over medium-low heat until soft and slightly browned.
Add the radicchio, and cook for another few minutes until it begins to soften.
Add the rice, and stir for a few minutes.
Add some vegetable broth, and begin the risotto process - cook til the liquid is absorbed, add more liquid, repeat until the risotto is done!
While the risotto is cooking, taste frequently for salt. If it's beginning to get too salty, add water to your broth.
When the risotto reaches the desired texture, add the optional ingredients (butter, additional oil, lemon juice, cheese), and stir. Cook for a minute or two to melt the cheese and butter. Taste again for salt and acidity, and add more salt or lemon juice if necessary.