Garlicky Broccoli Rabe with Sausage and Peppers

Fill a large, deep skillet with water and bring to a boil. Add a large pinch of salt and the broccoli rabe, cover and cook over high heat until tender, about 8 minutes. Drain the broccoli rabe in a colander, shaking off the excess water. Wipe out the skillet. Add the 2 tablespoons of olive oil and heat until shimmering. Add the onion and bell pepper and cook over moderately high heat, stirring occasionally, until softened and just beginning to brown, about 8 minutes. Add the garlic and cook, stirring, until fragrant, about 1 minute. Add the broccoli rabe, beans, stock and olives and simmer over moderate heat for 5 minutes. Season with salt and pepper. Meanwhile, heat the remaining 1 teaspoon of olive oil in a large skillet. Add the sausages and cook over moderate heat, turning occasionally, until browned, about 10 minutes. Mound the broccoli rabe and beans on plates, top with the sausages and serve.