Which of the following items does not contain alcohol?

Calamari is the correct choice as it typically does not contain alcohol. This dish is made from squid that is often battered and fried, served with various dipping sauces, none of which inherently contain alcohol as part of their traditional preparation.

In contrast, the other options are often associated with alcoholic ingredients or flavors. For instance, sangria is a beverage made with wine and typically includes fruit, making it obviously alcoholic. Chocolate cake might sometimes contain alcohol, particularly when made with certain liqueurs for flavoring, though this can vary by recipe. Similarly, fruit tarts can also sometimes be made with alcohol-infused elements, like certain flavorings or toppings. Hence, calamari stands out as the dish that is most commonly served without any alcohol, making it the correct choice.