What is a signature espresso in coffee competition?

At the WBC and affiliated competitions (national championships, Barista League...), each competitor prepares three services: classic espresso, milk drink (cappuccino or variation), and signature espresso. The latter offers the greatest creative freedom — and often makes the biggest difference between finalists. The barista has a total of 15 minutes to serve 4 sensory judges and 1 technical judge. The signature espresso must be built on an espresso or espresso-like base, to which at least one complementary ingredient is added: herbs, spices, fruit juices, vegetable reductions, food-grade essential oils, artisanal ferments... Regulations specify that alcohol is forbidden, and all ingredients must be of plant or natural origin. The beverage is prepared in front of the judges, with a mandatory verbal presentation explaining the concept, ingredients, expected aromatic profile, and creative logic. Judges score the drink on criteria such as: flavor harmony, coherence with the base coffee, creativity, presentation, and technical execution. The most memorable signatures in recent years have combined coffees with experimental processes and local seasonal ingredients — a trend reflecting the rise of coffee as a gastronomic and auteur product. For enthusiasts, discovering these creations through WBC live events or YouTube replays is a fascinating entry point into the frontiers of specialty coffee.