Question: If these are meant to be vegan, why do you use Guinness as it uses isinglass additive in processing? (ohladycakes.com)
Guinness extra stout is technically not vegan, but if you identify as a vegan and consume Oreos (that are made with sugar that's processed with animal bone char)(I called Nabisco HQ to verify), I'm going to go ahead and say it's totally ok for you to consume a cake that was made with beer that was filtered with isinglass — a byproduct of the fishing industry. (ohladycakes.com)
Our new filtration process has removed the use of isinglass as a means of filtration and vegans can now enjoy a pint of Guinness. (treehugger.com)