Step 1

Heat oil in a large saucepan over medium heat. Add onion and cook, stirring, until soft but not browned, about 5 minutes. Add rice and cook, stirring, for 2 minutes more. Add broth and wine and bring to a boil. Cover and simmer until the rice is very soft and the liquid is greatly reduced, about 25 minutes. Cool slightly.

Step 2

Transfer the mixture to a blender and puree, in batches if necessary, until smooth. (Alternatively, puree in the pot with an immersion blender.) The consistency should be similar to a pourable sauce; add more broth or water as needed. Season with salt and pepper.