Peel the potatoes and cut them into 1/4 inch thick fries. Keep them submerged in water to prevent browning.
Rinse the cut fries in a colander under cold water for about 20 seconds to remove excess starch.
In a large pot, combine the fries with cold water, vinegar, and kosher salt. Bring to a boil, then simmer until the fries are tender but not falling apart, about 10 minutes.
Carefully remove the fries and spread them out on a kitchen towel to dry and cool for 5 minutes.