This intense base is the secret to the full-bodied richness of the stew. Roasting emphasizes the vegetables' best qualities, and they're simmered with red wine and plenty of herbs and aromatics.
Cooks' notes:
· Stock can be made ahead and cooled, uncovered, then chilled, covered, 1 week or frozen in an airtight container 1 month. · Sauce can be made 2 days ahead and chilled, uncovered, until cool, then covered. Reheat before using.