Subway describes its tuna sandwich as “freshly baked bread” layered with “flaked tuna blended with creamy mayo then topped with your choice of crisp, fresh veggies.” It’s a description designed to activate the saliva glands — and separate you from your money. It’s also fiction, at least partially, according to a recent lawsuit filed in U.S. District Court for the Northern District of California. The complaint alleges the ingredient billed as “tuna” for the chain’s sandwiches and wraps contains absolutely no tuna. A representative of Subway said the claims are without merit. The tuna sold at the chain is wild-caught,...