The Cellar in Fullerton (https://www.cellardining.com).
The Summit House (https://summithouse.com), also in Fullerton.
Oh! Or, the Hobbit in Orange (https://www.hobbitrestaurant.com).
They all offer memorable experiences—especially the Hobbit—and never disappoint.
Ha-ha! Just realized I chose…
So, in Fullerton, there’s a couple that don’t work because of your restrictions. Summit House and The Cellar are primarily Steak, although they both have fish, and probably a chicken option too. But not a lot of selection once Steak and Fish are omitted.
Mulberry Street is good for upscale…
For that many people here are my recommendations.
Summit House Fullerton - 15 minutes from Disney, you can call and reserve the back dining room or a space outside that would work well. Amazing food prime rib, on the more expensive side.
La Casa Garcia - 5 minutes from Disneyland, good with large…