1/2 cup kosher salt
1 recipe ají, for serving
Place potatoes in a large saucepan and cover with water. Add salt and stir to dissolve. Bring to a boil over high heat. Reduce to a low boil and cook, stirring occasionally, until liquid has completely evaporated and potatoes are covered in a film of salt, about 45 minutes. Remove from heat and let potatoes rest for 5 minutes in pan. Toss again, then transfer to a serving bowl. Serve with ají.