At her summer home on Martha's Vineyard, Jessica B. Harris serves this bluefish spread with crackers as hors d'oeuvres (with a Ti' Punch cocktail
) to dinner party guests and at participants in her "five to sevens" — gatherings on the porch with drinks and small bites, so-called because they take place between the hours of five and seven o'clock. Smoky, rich, and creamy, this delicious spread brings together luscious smoked bluefish with light and fluffy whipped cream cheese, tangy whole-milk yogurt, and a dash of acidic hot sauce and horseradish. Don't skip on chilling the dip for at least 1 hour; time in the fridge allows the flavors and textures to meld. Be sure to re-season the blue fish spread with lemon juice and hot sauce after chilling as these ingredients will often mellow over time. The delicate crunch and neutral flavor of lavash or water crackers allow the smoky dip to be the star of the show. Bluefish is a popular and abundant fish on the Vineyard. Another smoked, oily-fleshed fish, such as whitefish, mackerel, or trout, may also be used here.