Problem is, in A... at least here in the U.S., Arugula is uncommon, especailly in restaurants. Having some friends that own and operate an upscale restaurant here, I find that they do good salads but Aurugula is rare.
It's an acquired taste and many people find it bitter. Usually, the smaller leaves are incorporated into other greens, especially Romaine. It's only after becoming a fan of the small leafed green that the peppery flavor comes through. Having grown some my self, I find that it beomces noticeably more peppery ifnot grown in the spring during cool months. it doesn't like dry conditions or hot sun...