Step 1

Heat 2 tablespoons of the oil in a medium skillet over medium-high heat. Prick sausages all over with the tip of a knife. Add the sausages to the skillet and cook, turning occasionally, until brown all over, 5 to 7 minutes. Transfer to a cutting board.

Step 2

Add onion, celery, and garlic to the skillet and season with salt and pepper. Cook, stirring often, until softened, about 5 minutes. Add beans and their liquid, the water, and season with salt and pepper. Bring to a simmer. Slice sausages and return to the skillet. Stir in the vinegar and remove from heat.

Step 3

Preheat broiler with rack in the top position. In a small bowl, stir panko, parsley, and remaining 2 tablespoons olive oil. Season the bread crumbs with a little salt and pepper and scatter over beans and sausage. Transfer the skillet to the oven and broil (watch carefully! Broilers vary like crazy) until the top is golden brown, 1 to 2 minutes. Let cool slightly before serving.