Assertion: tuna sandwich | /r/HasProperty | onion
Facets:
value: sometimes
type: TEMPORAL
Source sentences:
text: A tuna fish sandwich (or tunafish sandwich), also known as a tuna sandwich, is a sandwich made from canned tuna—usually made into a tuna salad by adding mayonnaise, and sometimes other ingredients such as celery or onion—as well as other common fruits and vegetables used to flavor sandwiches.