Happy Pear twins reveal how their third book is more accessible, why they're more relaxed about food, and happier

On arrival at the recently opened Happy Pear café in Clondalkin, I am greeted with a familiar sight: the Flynn twins are upside down in a 'mirror-style handstand' getting their photo taken. In between shots, they are swiping food off plates, handing it to passers-by and stopping to chat to everyone. Their energy is palpable, akin to a small child after they've consumed a giant bag of sugar cubes. When they talk it's with a ragged, energising symphony of sentence-finishing, often speaking in unison interrupted with raucous laughing. I had spent a week with the Flynn boys last summer working on their third cookbook, Recipes for Happiness, and was both amazed, impressed and exhausted by their verve for life.