2 lb (900 g) Yukon Gold potatoes, peeled and cut into chunks 4 tbsp (60 g) unsalted butter 1 / 2 cup (120 ml) half-and-half, warmed (more as needed) 2 to 3 tbsp (30 to 45 ml) prepared horseradish, drained 2 tbsp (8 g) finely chopped fresh chives 1 tsp kosher salt, plus more to taste 1 / 2 tsp freshly ground black pepper Optional: 1 / 4 cup (60 ml) warm beef broth or reserved braising liquid
Place potatoes in a large pot, cover with cold water by 1 inch, and add a generous pinch of salt. Bring to a boil, then reduce to a simmer and cook until very tender, 15 to 20 minutes. Drain well and return potatoes to the hot pot. Let sit 1 minute to steam off excess moisture. Warm the butter and half-and-half together (and optional beef broth) until steamy but not boiling. Mash potatoes until smooth (or pass through a ricer), then gradually fold in the warm butter-cream mixture until creamy and silky. Stir in horseradish, chives, salt, and pepper. Adjust seasoning and consistency with a splash more half-and-half if needed. Serve hot alongside the chuck roast, letting the roast’s pan juices pool over the puree.
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