In the UK, Tesco brand stores have a similar sandwich made with shredded cheddar, scallions and mayo. It is off-the-charts delicious and if you get lucky you c

In the UK, Tesco brand stores have a similar sandwich made with shredded cheddar, scallions and mayo. It is off-the-charts delicious and if you get lucky you can find it with a yellow label — a discount for food that is approaching its end of life — for 69p. (Shelf life dates are ludicrously conservative. Yellow label basically means the sandwich has been refrigerated for 12 hours.) I recommend washing it down with a Meal Deal including McCoys salt and vinegar crisps and a bottle of fizzy mineral water.