Fill a large, deep skillet 1/2 way with water. Bring the water to a steady simmer and add the sausages. Poach the sausages for 6 to 7 minutes, until firm.
Drain the sausages and slice into bite-size pieces. In a large skillet, heat 2 tablespoons olive oil. When hot, add the sausage and cook until brown. Drain off the fat and add the balsamic vinegar. Simmer until vinegar is reduced and syrupy. Serve immediately.