Panera Bread French Onion Soup

"The 1,115 Panera Bread locations are famous for fantastic sandwiches, but it's this delicious French onion soup that has inspired the most e-mail requests for a clone from the chain. The biggest difference I find with Panera's formula versus other onion soup recipes is the inclusion of a small, almost undetectable, bit of tomato sauce. But rather than opening up a whole can of tomato sauce to use just 1 tablespoon in this home kitchen counterpart, I found that a squirt of ketchup works perfectly. Panera Bread also makes their soup with just a bit of heat, so we'll add a little Tabasco pepper sauce to the pot to wake everything up. The croutons on top of the soup appear to be made from the chain's focaccia bread that has been buttered, cubed, and toasted until crispy, but you can use any bread you may have on hand. As for the cheese on top, the menu says it's Asiago-Parmesan, but the cheese I tasted was more Asiago than Parmesan, so you'll need to use only Asiago cheese (that's been shaved using a potato peeler) for a great clone. Source: "Top Secret Recipes Unlocked" by Todd Wilbur...."