Here, René Ryser, the so-called ’Cheese King of Gstaad’, shares the Swiss secrets to this perennially popular dish. When did you first start making cheese? I fell into cheesemaking by accident.

Sprinkle the remaining 1/2 of Swiss cheese and fried onions on top. Bake the casserole for five additional minutes to melt the cheese and warm the fried onions.

We asked a cheese scientist to explain what gives Swiss cheese its characteristic holes. Here's what he had to say.

Ohio has been home to massive Swiss cheese production levels for years due to the state’s history of Swiss immigration in the 1800s.