Dirty Gratin Scoundrels

I made my first gratin Sunday, with a recipe loosely based on Jeffrey Steingarten's. It was great. I made mine with Idaho baking potatoes, salt, pepper, butter and half-and-half. Lauren and I disagree on pronunciation, she says gratin is always pronounced like "rotten", where I argue sometimes a pronunciation akin to "rattan" is appropriate. I will email around to find out.