Make Ahead Tip: Prepare soup through Step 4. Cover and refrigerate the soup and cooked barley separately for up to 3 days. To serve, combine (Step 5) and reheat.
Shopping tip: Look for mushroom broth in aseptic containers in well-stocked supermarkets or natural-foods stores.
Ingredient note: Sherry is a type of fortified wine originally from southern Spain. Don't use the “cooking sherry” sold in many supermarkets--it can be surprisingly high in sodium. Instead, purchase dry sherry that's sold with other fortified wines in your wine or liquor store.
1 starch, 2 vegetable, 2 fat