In some countries, bitters are part of traditional holiday celebrations. Especially in winter, bitters containing warming spices and seasonal fruits are made. Cinnamon, ginger and clove based bitters with oranges or tangerines is a popular flavor for winter bitters. Some winter versions are actually served warm, to accentuate the warming effects.
There are also summer versions that are served ice cold with summer fruits like peaches, cherries or raspberries.