I'll just choose favorite foods from each ethnic group that I can think of
For chinese food, my favorite is a good General Tso's chicken, but I've been introduced to the honey walnut shrimp recently and it's fabulous. Always with hot and sour soup.
Thai: green curry and tom yum kai soup
Greek: dolmas are my favorite
Korean: neng myun - ice cold buckwheat noodle soup, so fabulous on a hot summer day
japanese: poke ball (like rice with sauce and sashimi pieces mixed in -- easier to eat than a huge mouthfull roll but just as much flavor)
edit: omg I almost forgot. Shabu-shabu...that overcomes sushi anyday. so freaking good. with the secret devil hot oil drops, sooo freaking mouth burning sinus clearing good
American: almost anything with hollandaise sauce (eggs benedict sooo good) or a good batch of seasoned fries with a side of ranch dressing
Mexican: erm...anything I can get with tequila...margaritas, enchiladas, tamales, chips and salsa...everything tastes nearly the same so it's all good for me.
Never got into indian food the couple of times I've tried it, and I am not really familiar with ethnic european foods.
african, closest I've come to is sweet fried plantains, but they are sooo good