Refrigerate for up to four days.
When Risotto Is Done: The easiest way to tell is to taste it. When the middle of the rice is no longer white, the risotto is done. Risotto should be al dente or completely cooked but firm to the biting.
Variations on Mushrooms: I used Baby Bella (crimini) mushrooms, but you may also use portobella, porcini, shiitake, white button, or a mix of all four.