What is the fine-grained topic of the following text: In Swiss markets, there are primarily three varieties most commonly sold: The English variety, which is long and contains few seeds; the Nostrano, which is shorter and fatter than the English variety, and can contain many seeds which contribute to a bitter flavor; The gherkin variety is often used to make dill pickles or cornichons. Only return the topic.
Varieties of cucumbers in Swiss markets