Having grown up on a farm in County Tipperary, Sam Pearson may not strike you as a likely food entrepreneur with aspirations to shake up the vegan market and build a business of international reach. But that is exactly what he is doing through Vegan Sandwich Co, a business he founded in 2019. The Currency interviewed him a few months later, at a time when he had just turned down an offer to partner with the cafe chain Insomnia after the two businesses found themselves in contact over the awkward use of similar branding for competing chicken-substitute fillet rolls. So,…