1 lb (450 g) cremini mushrooms, sliced 8 oz / 225 g mixed mushrooms (shiitake, oyster, or portobello), sliced 2 tbsp (30 ml) olive oil, for roasting mushrooms 1 tbsp (15 ml) olive oil, for soup base 1 tbsp (14 g) unsalted butter 1 / 4 tsp smoked paprika Kosher salt and freshly ground black pepper, to taste 1 medium yellow onion, finely chopped 2 celery stalks, finely chopped 1 medium carrot, finely chopped 3 garlic cloves, minced 6 fresh thyme sprigs (or 1 tsp dried thyme) 1 bay leaf 1 / 2 cup (100 g) pearl barley, rinsed 1 / 3 cup (80 ml) dry sherry 6 cups (1.4 L) beef stock (or mushroom stock) 1 tsp Worcestershire sauce (optional) 1 tsp lemon juice or sherry vinegar, to finish 2 tbsp (8 g) chopped fresh parsley
Heat oven to 425°F/220°C. Toss the mushrooms with 2 tablespoons olive oil, smoked paprika, a pinch of salt, and pepper. Spread on a sheet pan and roast until deeply browned and edges crisp, 18–22 minutes, stirring once. Meanwhile, in a soup pot over medium heat, warm 1 tablespoon olive oil and the butter. Add onion, celery, and carrot with a pinch of salt; cook until softened and lightly golden, 6–8 minutes. Stir in garlic and thyme; cook until fragrant, 30 seconds. Add the rinsed barley and the roasted mushrooms; cook 1 minute to toast slightly. Deglaze with sherry, scraping up any browned bits. Simmer until nearly evaporated, 2–3 minutes. Add beef stock and bay leaf. Bring to a boil, then reduce to a gentle simmer. Cook until barley is tender, 35–45 minutes, adding a splash of water if needed to maintain a brothy consistency. Discard thyme stems and bay leaf. Season to taste with salt and pepper; stir in Worcestershire (if using) and the lemon juice or sherry vinegar to brighten. Ladle into bowls and finish with chopped parsley. Optional: drizzle a little olive oil or swirl in a small pat of butter before serving.
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