Citron is a large citrus fruit. It is quite fragrant with a thick rind.
Choose citron based on its weight. It should feel heavy for its size. While the skin may be uneven, make sure that there is no decay on the outside. Citron can be stored at room temperature away from sunlight. Make sure they are unwashed.
Citron is very interesting to work with. You can peel away the outer, yellow rind and make a salad with the white part. You can also use the rind as a zest. Finally, you can make a fantastic syrup using the pulp of the fruit.