Here is a decent summary of international (ethnic) food in Jacksonville. My list is composed of what I feel are the best and only truly good experiences within driving distance. The radius of all of these is about 15 miles from the JTB/Southside intersection.
Disclaimer: none of the restaurants provides a more authentic experience than what can be found in places like New York, Chicago, Miami, etc. These are simply the best in the area and are comparable to the eats found in a bigger city but would not be defined as above average in a bigger city. These are the best of Jacksonville. Feel free to expand upon these, if they do provide a somewhat authentic experience.
El Rinconcito (Colobmian restaurant): picada, bandeja paisa, empanadas, arepas, morcilla, postobon, etc. Nice interior as well. Owners are great.
Antojitos Colombianos Panaderia (Colombian bakery). Fresh made. Owner is great. Breads, empanadas, etc.
Pho King: Nice interior. Many pho options, banh mi, bubble tea, the grilled pork rice dishes are awesome as well.
Piscos: ceviche, lomo saltado, Peruvian donuts, inka cola, etc.
Mi Pueblo (grocery). This place has a nice little kitchen in the back that makes cemitas, taco al pastor, etc. Basically no seating, get this sandwiches, tacos, etc to go.
Madrid (run by venezuelans but they make a lot of cuban items here). Ropa vieja, Cuban sandwiches, café cubano, picadillo. Empanadas are Venezuelan style.
Rico Mex. You can get baleadas here.
Flavors(restaurant). Nice lunch buffet. Tandoori chicken, dosas, paneer, vindaloo, etc.
Apna Bazaar (grocery).
Indian Grocery (grocery).
Sam Won Garden. Korean BBQ. Electric. A little pricey.
Dae Ho (Korean grocer). Four dollar kimchee tubs in the freezers in the back.
Bamboo Creek. Dim Sum order from menu.
Jax Oriental Market. Chinese grocery.
Las Antillas. Six dollar lunch. Hot counter setup.
Brazil Grill. Great brazilian buffet, but only open for lunch M-S. Feijoada, picanha, guarana.
Sammy's Italian Deli. Olives, deli meats, cheese, Italian imports, and make lunch sandwiches...get the Tony's Special.
Tommy's Brickoven Pizza. Crust is great. Sauce is good too. Tommy is the man.
Not going to list Thai and Sushi places. One on every corner, all basically the same. Nothing stands out in this group.
I will add to this list if I find new places.
Sam Won Garden Restaurant
4345 University Blvd S Ste 1, Jacksonville, FL 32216
4131 Southside Blvd, Jacksonville, FL 32216