This is a fantastic opportunity to engage with your customers and foster a sense of community, while also celebrating the talents and skills of your baristas.
Perhaps you could take it a step further and have seasonal themes, where the winning drinks appear on the menu for a month or so, keeping the offering fresh and giving a sense of novelty and excitement to return customers. You could even have an annual calendar planned with different themes already lined up, adding an element of anticipation.
Displaying the creations visually - online or in the cafe - is a great way to tantalize customers' tastebuds and keep the competition lively!