Buffettred 0
Warren Buffett, chairman and CEO of Berkshire Hathaway, attends the Allen & Company Sun Valley Conference on July 13, 2012, in Sun Valley, Idaho. - 

If you have a spare $3.5 million and a burning desire to break bread with Warren Buffett, we've got just the thing for you.

Mr. Buffett auctions off a lunch date with himself every year, proceeds benefiting the Glide Foundation, a charity in San Francisco that helps the homeless.

This year's auction starts Sunday. Bidding starts at $25,000, a price at which you could also buy about one-sixth of a share of Buffett's company, Berkshire Hathaway.

Follow Kai Ryssdal at @kairyssdal