There's no rule that says you can't make a platter of steak fries from more than one kind of spud. A russet and Yukon gold mash-up may just be the combo you need to make an epic plate of steak ...

So I hit the road with Johnny and Curious City intern Olivia Richardson, and we visited a half dozen steak and lemonade spots. Some owners told us the combo came from California. Others said it ...