Sandwiches diligently cut into “bite size” pieces. Presumably so that aircrew wearing oxygen masks can practice techniques for taking NAPS tablets whilst wearing a respirator.
Benson’s crisps. Preferably the sickly Prawn Cocktail flavour, where no single crisp is larger than a snowflake. It’s always entertaining to open the balloon-like bag at 20,000 feet.
A copious supply of tea bags and instant coffee for a trail is always entertaining. Also, though there may well be a time and place for Cup-a-Soup, the cockpit of a fast jet isn’t it.
Still, it stops one getting bored between tanker brackets.