Good Afternoon Bacardi,
Cava shall work marvelously with this salmon recipe.
Cava is produced in Sant Sadurní d´ Anoia, 35km from the city of Barcelona, in Catalonia.
However, Freixenet also has a line of sparkling wines produced in Sonoma, California.
If you are ever in Sonoma Valley, it would be a fabulous experience to visit their Winery and do a sampling. One can also, purchase Cava directly. They also have Cata Courses, which translates to Wine Tasting Courses. See their website.
Of course, Cava is alot cheaper than French Champagne. I have made it with both, and I have also made Cod fish in Cava too ... Nice ...
The key differences are: Cava is produced from indigenious white grape varieties and Chardonnay in Barcelona.
French Champagne is only produced in France predominately from red grapes.
The process is more or less quite similar and dates back to the mid 1850s, 1860s, when Barcelona first had begun production. Juve y Camps is one of the oldest and finest.
By the way, where is Copper River ? Sounds far west !
Enjoy the dish, which I am sure you shall and so shall your special guest !
Have a nice Monday.