1 cup (240 ml) coarse-ground polenta (not instant) 4 cups (960 ml) low-sodium chicken broth (or water) 1 cup (240 ml) whole milk 1 tsp kosher salt, plus more to taste 2 tbsp (30 ml) extra-virgin olive oil, divided 1 / 3 cup (80 ml) mascarpone cheese 1 / 2 cup (50 g) finely grated Parmigiano-Reggiano 1 bunch scallions, trimmed Freshly ground black pepper to taste 1 tsp finely grated lemon zest (optional)
Char the scallions: Toss the scallions with 1 teaspoon olive oil and a pinch of salt. Sear in a hot skillet or under the broiler, turning, until lightly charred and tender, 3–5 minutes. Roughly chop and set aside. Start the polenta: In a medium saucepan, bring the broth and milk to a gentle simmer with 1 teaspoon salt. While whisking, slowly rain in the polenta to prevent lumps. Cook low and slow: Reduce heat to low and cook, stirring often with a wooden spoon, until thick, creamy, and the grains are tender, 25–35 minutes. If it thickens too quickly, whisk in hot water or broth a splash at a time to maintain a creamy flow. Finish: Stir in 1 tablespoon olive oil, mascarpone, and Parmigiano-Reggiano until glossy. Season with black pepper and additional salt as needed. Fold in most of the chopped charred scallions and the lemon zest (if using). Serve: Spoon into warm bowls, drizzle with the remaining 1 tablespoon olive oil, and scatter the reserved scallions on top. Keep warm; thin with a splash of hot liquid if it firms up before serving.
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