cask ‘n flagon ups culinary game executivechefdonely liburd dishes out a revamped menu at fenway landmark restaurant. executivechefdonley liburd is stepping up the culinary game at fenway landmark, cask ‘n flagon , by debuting a revamped menu.chefliburd’s new menu items exhibit his culinary flair and bbq expertise and will complement signature cask favorites – such as wings, burgers, sandwiches and pizzas. what’s more? cask ‘n flagon boasts a 100% nut-free kitchen and most menu items are available gluten-free. i had the chance to sit down withchefliburd and talk with him about his new menu, the gluten free options, the gluten free procedures in place at cask ‘n flagon, and sample some of the delicious gluten free options.