The cake depicted a typical Irish meadow. It featured grass, rolling hills, hedgerows, a pond, a farmhouse and barn, meadow flowers and Irish dairy cows - all hand crafted from cake and sugar icing.
The edible creation measured four metres and took more than 168 hours to make.
Kerrygold laid out the cake on Finsbury Avenue Square for Londoners to sample. It produced more than 4,000 slices for hungry workers and tourists.
The stunt was devised after the brand discovered that four out of 10 Brits have never been to the countryside. Brazen PR helped deliver the event.
Gemma Singh, Kerrygold marketing manager, said: "We firmly believe that wonderful countryside is a huge asset for the nation and it is also really important that we make every effort to enjoy it. Our research even revealed that six per cent of the 2,000 adults we polled thought the National Trust was either a bank, a video game or a boyband.
"We were staggered at just how much of the British countryside is foreign to modern families. This led us to the idea of bringing a 'slice of the meadow' to city dwellers this summer with our huge cake created using Kerrygold butter."
In the same week, chocolate brand to promote its new Chocolate Mint ice cream.
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