OPTP short for One Potato Two Potato has now been around for 10+ years in Pakistan. Starting out in a unique location in Khadda Market, DHA, Karachi near ex-Deltons and AMI's paan shop, it's come a long way since them. With several branches it's now synoymous with gourmet fries.
There's several other good items on the menu, like their burgers and hot dogs. Though slightly pricey in my opinion, there's quality (and quantity) to match.
They have a pretty snazzy website too. Check the menu out at: