Colman's Mustard - its factory in Norwich is under threat of closure.
But the future of the plant is in doubt after Britvic, the soft drinks maker behind Robinsons, which co-owns the site, said it would be pulling out in 2019.
"We need to make Norwich as cost-effective and I will be asking the government to do all they can to keep Britvic and Unilever".
Consumer goods giant Unilever is considering the future of its Colman's Mustard production site in the United Kingdom city of Norwich.
Britvic has announced that it is to cease production there, which has prompted Unilever to announce a review about the future of its Colman's business on the site.
Production from the Norwich site will be transferred to its other sites in East London, Leeds and Rugby.
"Britvic and Unilever's operations have been uniquely intertwined at the site for many years, relying on a shared infrastructure", a spokesperson for Unilever said.
Unilever, which employs 113 people in Norwich, said Colman's "has been an important part of Norwich and the surrounding area for more than 200 years" and that it would work hard to retain the link.
"One of those options will include the potential closure of our Norwich factory".
The move is part of a three-year transformation programme unveiled by the company in 2015, under which it plans to invest £240m in its United Kingdom manufacturing operations.
Litherland said no decisions would be made prior to "full and proper consultation" with employees.
Britvic boss Simon Litherland justified his firm's move by stating it presents "significant" productivity and efficiency savings in its manufacturing operations and delivers "environmental benefits". Unite said that 32 of its engineering and maintenance members' jobs were at risk.
Production at the Chelmsford factory ceased in 2014.
Unilever confirmed on Tuesday that it was reviewing its production of Colman's Mustard at a manufacturing site in Norwich shared by Britvic, which announced earlier that it was closing its drinks business there.
Rhys McCarthy, Unite's national officer, said: "Unilever has today announced a review of the whole site to be concluded by the end of November. Colman's is in the DNA of the city".