Tasty Burger is a small chain in the Boston area that reminds me a bit of Smashburger.
For the most part, the burger was really well made. The beef was juicy and the produce was all very fresh, crunchy where appropriate, and flavorful. The Tasty sauce appeared to just be mayo; nothing about it really stood out to me.
The bun was very airy and fluffy as far as burger buns go but the bottom half was a little too delicate to sop up the meat juices without threatening to fall apart.
I'm not saying I'd make a trip out to Boston for one of these, but if you happen to find yourself there (or live there), it's a really nice burger.