Put the beans in a saucepan, cover them with water, and simmer until tender, several minutes for frozen beans, about 25 minutes for fresh. Drain, reserving the cooking water. Add the corn kernels to the pan with the butter, 1/2 teaspoon salt, and enough of the cooking water to barely cover. Cook gently for 3 minutes, then stir in the scrapings. Turn the heat to low and cook, without stirring, until most of the liquid is cooked off, 5 to 10 minutes. Season with pepper, pour into a serving dish, and add the parsley and a dash of paprika. Serve right away.