(Chico, CA) – On Tuesday, a Who’s Who of some of the nation’s top breweries got together to brew a new collaboration beer.

Update: A couple people raised a good question. Where was Russian River’s Vinnie Cilurzo? He was previously a collaborator on Isabelle Proximus. He was also previously a collaborator on La Birreria with Sam Calagione, who was in attendance for the collaboration brew, before having to pull out of the project last year.

It all went down at Sierra Nevada Brewing yesterday. Ken Grossman and Co. played host to Sam Calagione and Flores Delee of Dogfish Head, Tomme Arthur of Port Brewing/Lost Abbey, Adam Avery of Avery Brewing, and Rob Tod and Jason Perkins of Allagash Brewing.

You might remember that all of those breweries (minus Sierra Nevada) got together a few years ago to brew the infamous Isabelle Proximus. Now they are back at it again.

Brewbound reports, “The yet-to-be-named beer is being made with purple carrots, purple potatoes, red rice, honey, and driftwood from both coasts. Manley also said that some local mint might find its way into the brew. The beer will be available on draft only at each breweries respective pubs and tasting rooms, and should be complete next month.”

Knudsen Juice (it’s a brand, not a type of fruit) will be an important factor as well. The brewers had a tasting session sampling some different blends.

The day also included a visit to the Abbey of New Clairvaux, a local abbey with which Sierra Nevada is working for its Ovila series.

Things wrapped up with a beer dinner for 172 people.

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Photo credit: Allagash Beer on Twitter