What are Undyne's thoughts on Grillbys??
Well Grillby swaps with the Nice Cream Guy (Nicknamed "Nice-E.") in this universe so Grillby's is instead replaced by "Nice-E's Nice Cream Parlor" or "Nice-Z" for short. Instead of selling Burgers and Greasy food, it sells nothing but the best desserts in the Underground, like Slushes, Snowcones, Homemade Monster Candy, and of course, the famous Nice Cream Cone, a super sweet Ice Cream Cone with a compliment on the wrapper. This is also a place where Alphys and the rest of the Temmie Patrol like to hang out and Alphys is notorious for ordering a bottle of Hot Fudge and chugging the thing down in seconds.
Anyway, for Undyne. Undyne never goes there since she isn't a sugary food kind of person and more of a greasy food person. But one time Alphys managed to convince Undyne to go with her and unsurprisingly, they didn't sell Greasy food, but yet Nice Cream Guy sold RAMEN of all things to "Warm people up for the desserts."
Undyne was super confused how he sold Ramen to people, but not greasy foods like Burgers or Pizza, and Nice Cream Guy would always respond with a "Hey. Do I look at hot as Grillby?"
It's not a one off thing he says either, he says that like... everytime Undyne complains about it.
So Undyne ended up getting a snowcone and tried tossing the Snowcone part into the air like a snowball and have it all land in her mouth and she got the WORST brain freeze ever, she was desperate to get rid of the brain freeze that stormmed out and busted a hole in the wall...
So yeah... Undyne ajd Nice Cream Guy sorta don't like eachother very much and Alphys is still trying to pay for the wall. So that's Undyne's experience and thoughts on Nice-E's place.