1 - Cut the potatoes and carrots into small uniform cubes.

2 - Place them in a large pot and fill with water.

3 - Add salt and vinegar.

4 - Bring it to a boil over medium high heat, and then reduce the heat to medium and continue to cook until the potatoes are cooked through, about 15 minutes.

5 - Drain the potatoes and let it cool to room temperature.