1. Heat the vegetable oil in a sauté pan. Add the scallions and salt and cook over high heat until the scallions blacken slightly and take on a smoky flavor. Cool and mix with the soft butter.
2. Scoop the flavored butter onto a piece of waxed paper and roll into a cylindrical shape. Refrigerate for at least 1 hour.
3. Slice off “coins” of the butter to serve with boiled or grilled corn.