Unlimited Tea and Coffee?
Unusually Tasty Crab?
Unique Tasting Critters?
Throw me a frickin bone, here!
Wrong all through.
A bone: U is not Under.
Is the acronym the restaurant name or a description of what you can expect from eating there?
I’ll try
Underwater Taste Chalet
Utopia Tilapia Cornucopia
Has anybody been close?
Nobody’s even close yet.
Another bone: T = The
Sorry – didn’t spot the question before. It’s the name of the place and not what you’d expect to find there.
Usually The Cheapest/Cleanest/Case?
Sorry. Not it.
Wouldn’t be great if? Not it, though.
Uong Tohn Cilver’s.
Bustin’ a gut over here! 
Not it, though.
Unleash the Cod?
Unload the C-Word?
“I heard that!”
I’m hungry for seafood now.
Nice try. But wrong.
I thought that might happen!
Though not it, this has some amazing possibilites.
FWIW, I just heard this on the radio (stream really) with a jingle and all.
U is a preposition
T = The
C is a noun (what else?)
Common expression not necessarily related to seafood, but not altogether foreign to it either.
Urchin the Crustacean
Unhand the Cow
Unshell the Crab
Up the Crab?
None of these. Please see my previous post for clues.