By the time the JMC mining ship Red Dwarf went out on its last voyage, gazpacho soup was considered formal cuisine amongst the officers of the spaceships of the Space Corps. The soup was also a considered a delicacy of Red Dwarf captain Frank Hollister.
Captain Hollister once invited Arnold Rimmer, the Second Technician in charge of Z Shift, to such a formal dinner in the Officer's Club. As noted by Rimmer in his diary, in fact the only entry in it, "Gazpacho Soup Day" was on November 25th. Rimmer jumped at the chance as an opportunity to worm his way with the officers somehow, perhaps even get a promotion in the field, since he was the lowest ranking crewmember aboard Red Dwarf (before Dave Lister joined up), had been with the JMC 15 years and failed his astro-navigation exams as many times.
At the dinner, Rimmer was revelling being at the party, but however was unaware that gazpacho is meant to be served cold. Rimmer loudly complained to the kitchen staff about it being cold, ordering it sent back to be reheated. With the captain, all the officers and the chef laughing, Rimmer thought that they were laughing at the chef, but realised they were actually laughing at Rimmer.
An embarrassed, shamed and horrified Rimmer believed that this event caused him to not receive a promotion, hindering his career and holding him back as a failure. When the radiation leak that killed the crew happened , Rimmer's lasts words were "gazpacho soup", which Dave Lister watches as a recording three million years later.
Rimmer's clone hologram mocks the primary hologram Rimmer about the incident, which the primary Rimmer says is the most hurtful thing he could have said. Under the belief that he is about to be deleted as a hologram, Rimmer tells Lister about the incident. Lister deletes the clone and tells the primary Rimmer that he won't mock him about it, but cannot resist one little joke, saying "souper" instead of "super". ("Me²") (Infinity Welcomes Careful Drivers)
Behind the scenes
Rimmer's gaffe with the gazpacho soup incident was based on a real life incident involving Rob Grant and Doug Naylor; while in a meeting with Thames Television, the two were served gazpacho soup and were baffled as to why it was served cold. However, unlike Rimmer, they chose not to complain and were later relieved to find it was indeed meant to be served cold.