This recipe for Nam Prik Ong makes a small portion suitable as an appetizer for about four people. For larger groups, simply scale it up. Some versions of this recipe call for the addition of a small portion (1 teaspoon) of shrimp paste, a tofu sheet or fermented soy beans. I think the dish does fine without them, as they are difficult to find and the quantities needed are so small.
Thai name: Nam Prik Awn
These little wrapped meatballs are quite a popular afternoon snack. They would make quite a good appetizer, or finger food for a party. Stalls will specialize in this and nothing else. As with noodle stalls that get a reputation, people will drive a long distance just to get to a good dumpling stall.
Freshly steamed dumplings still in the steamer
This cooked sausage, called sai-ooa, is one of the foods that Thais associate strongly with Chiang Mai. You can purchase it fresh at most markets, and you'll see coils of it grilling on barbecues at stalls all around town.
Chiang Mai sausage meatballs
This has to be one of the most common dishes in Thailand, from food stalls to fancy restaurants. Some variation of this recipe will appear very regularly at the curry stalls, often several times a week. The dish is easy to prepare and can be made hours in advance, since it is quite acceptable to serve at room temperature.
Fresh Vietnamese Spring Rolls and sauce
One of my favorite Indonesian side dishes is corn cakes. They come in a lot of different types, since it seems almost every regional cuisine has some kind of them. I found this recipe in a small book of Indonesian favorites. It calls for peanuts, which I'm not sure I've had before. If you're allergic, just leave them out.