A young woman ended up in hospital after going into anaphylaxis after one of Cardiff's most popular restaurants served her nut oil, despite being aware of her potentially lethal allergy. Carla was visiting the Welsh capital to celebrate her boyfriend's graduation, and dinner at Maison De Boeuf, located in Castle Arcade, was part of these plans. On July 16 the 21-year-old from Bristol said she sat down for dinner and was given an onion tart starter that contained nut oil, despite telling the waiter that she had a life-threatening nut allergy. According to the restaurant Carla was served by a manager, as is its policy when someone discloses an allergy. Carla informed the restaurant staff she was allergic to dairy and shellfish, and that she carries EpiPens for her nut allergy - a type of epinephrine auto-injector used to treat severe allergic reactions. Carla told WalesOnline: "I, of course, told the waiter [about my allergy] as soon as I was handed my menu. "The waiter listened and took time to go through the menu with me to tell me what I could and couldn't have. "I was offered an onion tart that was not on the menu but I was told they serve it all time as a vegan option, and the manager assured me it was free of all of my allergens. "When it came, I had a few bites and within one minute my throat started to get itchy, which is the first sign for me that I am having an allergic reaction. "At this point, I naturally stopped eating, had some water, and took an antihistamine. I had one more bite as I was not 100% sure it was my allergy, as I had been reassured by the manager that it did not contain any of my allergens, then I suddenly felt really unwell." Carla recalled starting to feel "really faint, hot, and sweaty" before "passing out" at the table. "[I started] projectile vomiting all over myself. My boyfriend went up to the restaurant staff and said 'please call an ambulance,'" she claimed. At this point, Carla claimed she was in anaphylactic shock. Anaphylaxis is an allergic reaction that happens very quickly, and without treatment can result in death. For the latest restaurant news and reviews, sign up to our food and drink newsletter here . "The manager who had served me and came over, crouched next to me, and I asked [them]: 'Please can you tell me what was in that tart, I need the full ingredients list,' Carla claimed. "[The manager] went into the kitchen before coming back to the table with a list on [their] phone that read: 'Onion, salad, dressing, pastry'... they were all components of the tart - not the full ingredients. "They did not have an ingredients list, let alone an allergen list for a menu item they claimed to be allergen free. How could they have ever known it was allergen free if they did not know what was in it? "They told me the tart was sourced from a small family business, and so they had no full ingredients list. If I had been told this upon ordering the tart, I would not have ever eaten it." Carla’s boyfriend was informed by the paramedics on the phone that it would be a 6 hour wait for an ambulance, and so Maison de Boeuf staff gave her £30 for a taxi to the University Hospital of Wales where she was triaged. "Due to the long wait at A&E, and because my condition was stable at this point, my mum drove to the Heath from Bristol and took me to see my usual doctor back home, who confirmed I had suffered anaphylaxis," Carla continued. "Still to this day, Maison De Boeuf has not told me exactly what was in the tart. I found out [that it was nut oil] from the statement they sent to you (WalesOnline)." Maison De Boeuf, who are owned and managed by the same family that run Gin & Juice, Coffee Barker, and Rum & Fizz, have admitted to serving Carla food containing nut oil. When WalesOnline approached the restaurant we received two different responses. The first response stated that the item consumed by Carla "contained nut oil". It continued: "We sincerely apologise to the guests affected by this incident. We appreciate how frightening this experience must have been for her and her family...Regrettably, due to human error, our team did not correctly communicate this, resulting in incorrect assurances regarding allergens in the tart." The restaurant later issued a new statement to WalesOnline. Within the response Maison de Boeuf said it had "taken full responsibility for failing to communicate" the allergens in this instance. It also states that an "incorrect item" was served due to a "human error" and a "miscommunication". The full statement reads: "We sincerely apologise to the guests affected by this incident. We appreciate how frightening this experience must have been for her and her family. "However, we are confident in the allergen process we employ within our restaurant. We ask every guest twice whether they have any allergies. Initially they are asked at the host stand, and then again at the table by their server. "If a guest makes us aware of any allergies then the server is immediately replaced by the manager on duty who becomes responsible for the table. Only management or supervisors take orders from tables with allergies. We are confident that Carla was asked by our team whether she had any allergies and was then only served by the manager. "The manager then takes the time to explain the menu and the allergens present in this dish. In this case our vegan tart was chosen. Unfortunately, due to human error, a miscommunication occurred, and Carla was served an incorrect item. We are confident that this issue will not be repeated as we have since removed this specific item from our menu. "As soon as we were made aware of Carla’s reaction our team phoned an ambulance, handed the phone to Carla's boyfriend. Carla’s boyfriend was then informed that the wait for an ambulance would be around three hours as they determined that her condition was stable. Carla then made the decision to go to A&E and so we provided a taxi. While at the hospital our manager and the head chef spoke to a nurse. "We sincerely regret that an incident occurred and have taken full responsibility for failing to communicate these allergens in this instance. In the days following the incident we were in direct communication with Carla to inform her of our investigation and the outcome into what we believe occurred on the evening. "Unfortunately, Carla was unable to take our call on Monday, July 21 asking us to call back on Tuesday, July 22. We called back as requested at 10am the next day but the call was not answered. We called back again at 10.15am, again with no answer from Carla. "The next communication we received was from the press. At this time we expressed that we were still eager to communicate our investigation findings and to resolve directly with Carla should she wish to do so as she was given our managers private telephone number. However communication has since as the press have become a third party and we have not had opportunity to resolve this privately. "We serve thousands of guests each month, including hundreds with complex dietary needs. Everyone at Maison De Boeuf is deeply committed to guest safety and integrity every day. "We remain open to private resolution of this matter."