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