Rub gently the frozen corn with butter and salt so that the salt sticks to the whole surface.

Wrap the corn in aluminium foil as tight as possible and put the corn into heatproof dish.
Put such prepared cobs in a preheated oven at 200 ° C and bake for about 20 minutes. Then, cut gently the foil and stick toothpicks into the sides of the cobs.

Enjoy your meal!