Concession stands are usually associated with hot dogs, cotton candy, pretzels and funnel cakes. But some businesses have made a go of some novel concession stands that serve gourmet, restaurant-style food, international cuisine or treats you don't usually find in a trailer, like cupcakes. Austin, Texas, has made something of an art of "trailer food" with whole parking lots full of interesting concession stand offerings.
People think of concession stands as cheap finger foods, such as hot dogs and nachos. But some concession businesses, such as Levy Restaurants in Minnesota, provide crab cakes and sirloin at its concession stands. Providing food that people generally don't expect from a concession stand could make your concession a destination for discriminating eaters.
Many people find it difficult to escape fat, salt and sugar when in a concession area. You could provide an alternative with healthy foods, such as smoothies, salads, fresh fruit cups, yogurt, granola and nuts. You could take a page from the raw food movement and use some raw food recipes to come up with a signature specialty.
In Austin, Texas, where concessions are a preferred form of dining, there are many international concessions, such as Cazamance, which serves African food, like roasted curry garden vegetables and Moroccan lamb sausage with sweet tomato reslish. There's also G'Raj Mahal Indian food and other international foods. Or you could do a crepe concession as is popular on the Ile St. Louis in Paris or gelatto stand which is ubiquitous in Italy.
Desserts often create a draw. Some interesting dessert options might include giant donuts or dessert waffles, giant cupcakes in various flavors with different toppings or upscale sno cones with finely shaved ice like snow, instead of ice chunks, covered with fancy syrups and creams. Having a gourmet cheesecake, custard or flan concession could also appeal.