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.