I've never had the Kate & Ella drink, Whoever, so I'll have to tell you about it after we have one.

Thank you to our friend Leslie for telling us about it.

I did find this online though...
"Can you keep a secret? The elegant Napa Rose Restaurant in the Grand Californian Hotel at the
Disneyland Resort has a secret cocktail you wont find on the menu, but can only order by name. Created by the Disney mixologists at the Napa Rose, the Kate & Ella (a citrus-y martini-style beverage) is a delicious tribute to some local Anaheim history.In the late 1800s, John and Margaret Rea, and
their daughters Kate and Ella, owned and worked a vast walnut farm on land where the hotel and restaurant currently sit. Katella Avenue, which borders the southern edge of the Disneyland Resort, is a combination of the girls names.
Some fifty years later, Walt Disney purchased a portion of the original Rea ranch land, and today it encompasses a small chunk of Disneyland Park (including the Jungle Cruise hipo pool), all of Downtown Disney, nearly half of DCA (River Rapids, Paradise Pier, etc) and the entire Anaheim Convention Center!
If you dine at Napa Rose, raise a glass to Kate & Ella and think of all those beautiful walnut trees that used to grow right where youre sitting!
Just dont tell anyone. This is our secret!"