A man posted photos of the surprisingly well-preserved jar to Facebook group Old Shops Australia, claiming his father found it on a building site 40 years ago. Another group member pointed out this particular design was used for Vegemite between 1930 and 1939.
The images show a glass jar with a rusted lid and a torn yellow label including a vintage version of the iconic Vegemite logo. But what really stunned fans of the household staple are the featured serving suggestions.
The label suggests using Vegemite in "soups, stews and gravies" as well as mixing half to a whole teaspoon with milk or water for a "nourishing beverage", throwing social media for a loop.
"Vegemite on toast just about every day of my life but in milk you have to be kidding," one Aussie commented, while others declared the once-popular concoction "disgusting", "yuck" and "awful".
"Here darl have a cup of hot sodium" and "Anyone for a hot Vegemite milkshake?" joked other group members.
Some Facebook users were sent on a trip down memory lane, reminiscing about being given the unusual mixture when they were sick as children.
"My mum used to make Vegemite soup for us when we were sick as kids. It was so good," one woman wrote, while another woman said her mother gave it to her when she had glandular fever in the 1980s. "She said her mum (my nanna) would give it to her when she was sick! Omg I'll never forget it because I swear I threw it up and could still taste it for days, argh was just awful," she commented.
Others claimed to still enjoy a hot cup of "Vegemite broth", with one man writing, "Teaspoon of Vegemite in a cup of boiling water, tip over cut-up buttered bread. Yum."
The unusual Vegemite combinations didn't stop there, with one mother adding that her children would "complain if there was no Vegemite on their Weet-Bix and milk".
In a separate Reddit post, someone shared three magazine recipes that listed Vegemite as a key ingredient in brownies, bolognese and cheesecake.
"There was an entire Vegemite themed recipe section," the Redditor wrote, to which another responded that anything with "Vegemite chucked in is just basic home cooking."
The cooking revelations come soon after Vegemite launched a new marketing campaign featuring limited-edition labels. Encouraging Aussies to cook with the spread, the word "Vegemite" has been replaced by the names of various dishes that can be made with it including nachos, bolognese, pizza, pho and stir fry.
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