Some 245 cheese factories in Switzerland produce Emmental, accounting for 50% of all its cheese exports. In 2003, the Swiss produced 34,634 metric tons of Emmental and exported nearly 80%.

Step 3: Add emmental slices, then the lamb's lettuce and arugula. Step 4: Spread the rest of the sauce on the other half of the bread ad then grill your sandwich for 5 minutes.

The cheese is matured to a four-month classic, eight-month "Reserve," 12-month "AOP extra," and 24-month vintage. Ninety-five percent of cheese sold with Emmentaler label are fake Emmentaler.

The experiment, titled "Cheese in Surround Sound," started last fall with nine 22-pound wheels of Emmental cheese placed in nine separate wooden crates.