An "occasion dish" refers to a special type of food that is prepared or served on specific occasions or events, such as birthdays, holidays, or anniversaries. It is usually meant to be unique, fancy, or celebratory. Full definition
Oh yes, I love shrimp with pasta but its definitely a sort of special occasion dish for us because we more often have chicken with pasta since we forget to buy the shrimp! (acookingmizer.com)
And the crab here makes it a luxurious, special occasion dish as well. (thewickednoodle.com)
Or am I trying for a special occasion dish because of a certain holiday? (flare.com)