Pre-heat the oven to 200C / 390F
Slice the potatoes into long, chunky fries. I suggest leaving the skins on for this recipe.
Boil a saucepan of water and then remove from heat. Soak the fries in the water for about 20 minutes. Do not add any more heat- you just want the fries to soak, not cook. Doing this will help them to get a soft inside.
Drain, and leave to completely dry out. (This a good time to make the dip)
Toss the potatoes in olive oil to coat, and then add to a baking tray.
After 20 minutes, remove from the oven. Flip the fries carefully (they are prone to breaking at this stage) and sprinkle the onion, garlic, green chili and dried spices on top.
Return to the oven and bake for another 20 minutes. They will at this point be fully cooked. But if they aren't quite crispy enough (it depends on the strength of your oven's fan and whether there are any cool spots in your oven) I suggest grilling them for another 5-10 minutes until you get your preferred crispiness.
Now pile them on a plate and add the cilantro/fresh coriander and a squeeze of lime juice.