There's lot's of good eating in Uniondale (and nearby Hempstead, but that's a tale for another time). The trick is explore the streets to the South of Hempstead Turnpike. There's Carribean, South American and probably some surprises out there.
Here's some places to get you started. Be sure to report back.
Brooklyn Fish & Chicken
624 Jerusalem Avenue
Uniondale, NY 11553 (also 524 Broadway, Amityville)
There's 14 kind of fish sandwiches on the menu: flounder, whiting, porgies, blue fish, salmon, red snapper, weakfish, croakers, king fish, fish cakes, Brooklyn fish, catfish, cod fish, and crab cake. They offer dinners with all those 14 varieties as well as things like shrimp, scallops and oysters. I figured I'd stick to the basics on my first visit and went with flounder. The fish was breaded and fried to order. It was on standard Wonder Bread style whole wheat, but the bread was very fresh. The fish was cooked nicely, but not as crispy as I would have liked. Also, I would have liked a bit less salt, since I like to liberally apply hot sauce, which provides it's own saltiness. It's probably the right amount of saltiness for glopping on tartar sauce. Sweet potato pie was bland, if you want a dessert go next door to Cuquita Bakery.
614 Jerusalem Avenue
This Hatian Bakery is filled with all kinds of tasty looking imperfectly shaped sweets. The sign outside also claims empanadas and other savories, but I haven't tried any of those yet. What I did try was a delicious coarse grained cornbread. I was served a huge piece for a dollar. In fact, everything in the place seemed to be a dollar. Everything was also wrapped in aluminum foil after being cut, just as you can imagine a Haitian grandmother would do with her fresh baked goodies. I also had some pineapple raisin upside down cake. The cake was rich and buttery enough to be eaten on it's own, but the rum laced topping definitely enhanced the experience (just don't plan on eating the giant piece on your own, at least not in one sitting). I noticed some large freshly made cinnamon cookies and was about to order one of those, when I was told they were three for a dollar. Unfortunately, I can't resist a bargain. I realized my mistake when I saw the man reaching for a pile of pre-bagged stale cookies. They looked and tasted old. Stick with the fresh looking items here and you'll be ok. I asked about a milky looking unlabelled drink in the fridge and the man behind the counter indicated that it was lip-smackingly good by kissing his fingers. It was a corn and evaporated milk drink (forgot the name something like akimme), that lived up to his promise. It had the consistency and filling power of a banana shake.
540 Jerusalem Ave
Uniondale, NY 11553
I had a nice homemade looking beef patty. The patty was flaky and good. The filling had a nice amount of spiciness, but not an overpowering amount. Probably worth future exploration.
1099 Front St
Uniondale, NY 11553
I had been set hip to this place years ago when I used to work with some Trinidadians. Roti are flat breads that are wrapped around various fillings. You can also order "bust-up shot" style where the bread (a different style) is broken into pieces and served on the side. Roti are filled with a variety of meats and veggies. The Indian influence is seen in my favorite filling of potato and channa (chick peas). I always ask them to make it spicy, otherwise it's a bit bland for my taste. If you're a spice masochist or smoker with dulled taste buds ask for sliced peppers (scotch bonnet, I believe). Chicken is available with bones or boneless for gringos. On the bone is traditional and tastier. I think I remember that they make Trini style Chinese on a certain day of the week, but I'm not sure which day.