Roasted Garlic Gravy
1 large head garlic
2 tablespoons olive oil plus additional for drizzling
1 leek, quartered and washed
1 onion, left unpeeled, quartered
2 carrots, quartered
1 parsnip, quartered
2 celery ribs, quartered
1 Turkish or 1/2 California bay leaf
1/2 teaspoon black peppercorns
1 1/2 cups dry white wine
1/3 cup soy sauce
6 cups cold water
5 tablespoons unsalted butter
1/3 cup all-purpose flour
Roast garlic and make stock:
Preheat oven to 400°F.
Separate 6 cloves from garlic (do not peel), drizzle with a little olive oil, and double-wrap tightly in foil. Roast until garlic is very soft, about 45 minutes.
While garlic roasts, heat oil (2 tablespoons) in a 4-to 5-quart heavy pot over medium heat until it shimmers, then cook vegetables, remaining garlic cloves (separated but not peeled), bay leaf, and peppercorns, stirring occasionally, until browned, about 8 minutes. Stir in wine and boil until most has evaporated. Add soy sauce and water and simmer, uncovered, 30 minutes.
Strain stock through a fine-mesh sieve into a large measuring cup. If you have more than 4 cups, boil to reduce; if less, add water.
Mash roasted garlic to a purée.
Melt butter in a heavy medium saucepan over medium heat. Stir in flour and garlic purée and cook, stirring, 2 minutes. Slowly add stock, whisking, then simmer 3 minutes. Season with salt and pepper.
Cooks’ note: Stock or gravy can be made 3 days ahead and chilled.