Brian O’Sullivan,  CEO of Fulfil Nutrition. ‘For me to hit the jackpot means to be the number one snack bar brand in Ireland and the number one in the UK and the number one in the US.’ Photograph: Aidan Crawley for The Irish Times

It all comes down to taste. When Fulfil first launched its protein-rich nutrition bars in early 2016, the outlook for the brand was quite modest, say(...)