The 126-year-old chocolate bar is described by auctioneers as "very rare, if unappetising".
Residents in Torpoint take dim view of Cornwall Council's plan replace historic lamp.
Hobhouse is little-known in the UK but a heroine in South Africa for her work in the 1899 Boer War.
The bar was one of a batch sent by Queen Victoria to British troops fighting in the Boer War.
Emily Hobhouse is credited with saving thousands of lives in South Africa.
The Fusilier Museum Warwick explores soldiers' provisions and utensils over the years.
A descendant of the solider said he would be "bemused" but "rather pleased" by the tribute.
The former home of anti-war campaigner Emily Hobhouse has been restored and turned into a museum.
The plaque is now part of the Potteries Museum & Art Gallery's collection.
