Whenever I travel/live/work somewhere else, my favorite conversation starter is "what 3 books from your country should I read". When they reply back asking what 3 American books they should tackle, "Grapes of Wrath" is the first I mention. Honestly of the great American authors, I think Steinbeck might be the most accessible. Not at all dated and his style is easily translated (neither Hemingway terse, nor overly florid, and not steeped in any particular vernacular like Twain or Faulkner).
It's certainly a bigger read than Of Mice and Men, but it's worth it. A great American tale set in the depression era. He's at his best when writing with a populist indignation. The end is shattering as well.
I hope you try it.