Combine the broth and dried porcini in a large wide saucepan and bring to a boil. Reduce heat, cover, and simmer over low heat 15 minutes. Line a large fine-mesh strainer with a dampened paper towel and set over a bowl. Strain broth, reserving the porcini and the broth separately. Rinse saucepan of any grit left behind from the reconstituted porcini and wipe dry. Mince t