Recently Dana wrote about the virtues serving a simple aperitif, both for its palate-awakening qualities and as a gesture of hospitality before the meal. For those who prefer to sip a non-alcoholic beverage, let us suggest the blood orange shrub.A shrub, if you aren’t familiar, is a drinkable vinegar made from fruit, vinegar, and sugar. Mixed with fizzy water, it makes a tart, refreshing soda and palate cleanser. Shrub syrup can also be used as a cocktail mixer.