Owen Carey, 18, who had a extreme dairy allergy, died after the journey to Byron on the O2 Arena in Greenwich, London, whereas celebrating his birthday together with his household.
He began to expertise signs after leaving the restaurant earlier than later collapsing outdoors the London Eye.
Mr Carey died at St Thomas’ Hospital in central London in April 2017.
An inquest at Southwark Coroner’s Court heard on Thursday that Mr Carey, of Crowborough in east Sussex, had ordered a thin grilled hen burger with no sauce from the restaurant.
But the inquest heard the menu did not present the merchandise contained buttermilk.
Barrister Clodagh Bradley, who’s representing Mr Carey’s household, argued the omission might make a buyer “believe” it was a plain hen breast.
Aimee Leitner-Hopps, Byron’s technical supervisor who’s answerable for guaranteeing groups are absolutely skilled in meals security, mentioned there have been many element elements in dishes that had been not elaborated on within the menu.
She mentioned: “If you have an allergy you should be asking for information and the team would be able to provide that information in the allergy guide.”
Coroner Briony Ballard requested why allergy data had been within the “fine print” on the again of the restaurant’s menu from 2017.
Ms Bradley additionally instructed the data was “difficult to read”, stating it was in “black print” towards a blue background.
Ms Leitner-Hopps mentioned: “I believe most companies had been taking the identical method that the client would inform the restaurant about [their] allergic reactions.
“We have had quite a few native authority visits through the years,” she said, adding the restaurant had “by no means been instructed” the wording was not clear sufficient or was too small.
She mentioned for the reason that incident, and following analysis exhibiting one in 10 folks aged 16 to 24 disguise their allergic reactions, employees now ask prospects instantly if they’ve any allergic reactions or dietary necessities.
Ms Leitner-Hopps mentioned all employees on the time obtained on-line allergen coaching, which required them to tick totally different sections, together with on-site coaching.
“It was obvious to me coaching accessible to the groups was enough,” she mentioned.
The inquest heard that when employees are knowledgeable about an allergy, they press a button that ensures the world “allergen” is highlighted on the order ticket, together with area for additional particulars, she mentioned.
Staff are then anticipated communicate instantly with the kitchen staff to make sure the allergy data has been obtained.
Coroner Ms Ballard mentioned she would not learn the report of the restaurant’s head chef because the “error” appeared to lie on the “point of ordering and not at the back of the house”.
The inquest is ready to proceed on Friday.