The inspiration for this salad comes from the Seder plate: Although the "bitter herb" is often horseradish, in the Sephardic (or Mediterranean) Jewish world, it can be an assertive green, one with bite. We chose dandelion greens, which are at their peak this time of year. (Please note: for Ashkenazi Jews, the mustard in this recipe is not considered kosher for Passover.)
Glogg is essentially a warmed punch made with an infused distilled spirit such as vodka or aquavit as well as fortified wine -- that is, wine that's had extra alcohol added. The infusion needs to steep for a week, so factor that into any party plans.