1 large leek, trimmed, cleaned, halved lengthwise 2 shallots, unpeeled 1 small head garlic, halved crosswise 1 oz (28 g) dried porcini mushrooms 2 cups (480 ml) very hot water (for soaking porcini) 4 cups (960 ml) low-sodium beef stock 1 tbsp (15 ml) olive oil 1 small carrot, thinly sliced 1 celery stalk, thinly sliced 6 fresh thyme sprigs 1 bay leaf 6 black peppercorns 2 tbsp (30 ml) dry sherry 1 tsp (5 ml) sherry vinegar Kosher salt, to taste Chopped chives, for garnish
Char the aromatics: Place the leek (cut side down), shallots, and halved garlic in a hot dry skillet or under a broiler until well charred in spots, 5–7 minutes. Let cool slightly, peel the shallots, coarsely chop the leek, and squeeze the garlic cloves from their skins. Soak the porcini: Put dried porcini in a heatproof bowl and cover with 2 cups very hot water. Soak 20 minutes. Lift mushrooms out, strain soaking liquid through a fine sieve or coffee filter to remove grit, and reserve. Coarsely chop the porcini. Build the base: In a medium pot, heat olive oil over medium heat. Add carrot and celery; cook 3 minutes until slightly softened. Stir in chopped leek, peeled shallots, squeezed roasted garlic, and chopped porcini; cook 2 minutes until fragrant. Simmer: Add beef stock, the strained porcini soaking liquid, thyme, bay leaf, and peppercorns. Bring to a gentle simmer and cook uncovered 30 minutes, skimming any foam. Strain: Pass the broth through a fine-mesh strainer, discarding solids, for a clear, aromatic broth. Finish: Return broth to the pot. Season with salt, add dry sherry, and simmer 2 minutes to mellow. Remove from heat and stir in sherry vinegar. Serve: Ladle into warm bowls and garnish with chopped chives. Add a crack of black pepper if desired.
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