Farro with Acorn Squash and Kale

Preheat oven to 375 °F. Melt 1 tablespoon butter in a medium saucepan. Add squash, season lightly with salt and pepper, and toss to coat. Spread out on a rimmed baking sheet. Roast, turning squash every 10 minutes, until tender, 30-35 minutes. Cook kale in a large pot of boiling salted water until wilted, about 2 minutes. Transfer to a bowl of ice water to cool; drain. Heat oil in a large ovenproof skillet over medium heat. Add farro; toss to coat. Roast in oven until toasted, stirring once, about 6 minutes. Transfer to a bowl; wipe out skillet. Melt 2 tablespoons butter in same skillet over medium heat. Add onion and cook, stirring occasionally, until translucent, about 4 minutes. Add garlic; stir until aromatic, about 2 minutes. Add wine; increase heat to high. Stir until almost evaporated, about 2 minutes. Add farro and 1/2 cup warm stock mixture. Stir until almost all liquid is absorbed, about 3 minutes. Continue cooking, adding broth by 1/2 cupfuls and allowing broth to be absorbed between additions, until farro is tender, about 1 hour. Add kale, squash, remaining 1 tablespoon butter, and cheese; stir gently until butter and cheese are melted and vegetables are heated through, about 2 minutes. Season to taste with salt and pepper.