Burke: It is made by Kraft, comes in 4 oz jars, and is, I believe, a "processed cheese food". It does not need refrigeration until opened, is usually on an aisle end display with grated Parmesan and Velveeta. There is also sliced Old(e) English cheese in refrigerator cases, you might be able to melt it, and stir it in quickly then let set up again.

If you are outside the US, I don't know.....I think Old English is a sharp yellow cheddar.......