Forget everything you know about traditional red sauce lasagna. Today, Gabe is taking you into the kitchen to make authentic Lasagna Bianca completely from scratch. With layers of homemade besciamella (béchamel), sausage, mushrooms and fresh pasta sheets, this white lasagna is a true labor of love. He caps it off with a Tiramisu-Inspired Affogato, which combines two classic Italian desserts into a single quick, elegant treat.