Preheat the oven to 200C and line a large baking tray.
Cut the potatoes into long chips and then place in a saucepan. Pour in 1 cup of vinegar and 2 cups of water. Ensure that all potatoes are covered in liquid. Bring to the boil and then reduce to a simmer for 5-7min or until a knife just goes through the potatoes.
Drain the potatoes and then spread them out on the baking tray. Drizzle with remaining 2tbsp of vinegar and then sprinkle with salt.
Bake the potatoes in the oven for 30mins or until golden.
Serve with aioli!