Heat oil in a large nonstick skillet over medium-high heat. Add onion; sauté 5 minutes or until lightly browned. Add chard; stir-fry 10 minutes or until wilted. Stir in Worcestershire, salt, and pepper.
This was my first time eating Swiss Chard and it was sooooo tasty! This recipe was quick and easy, much like cooking spinach. Too bad Swiss Chard is $3.99 a bunch in my area...that seems pretty steep for a veggie.
We slow-cooked the onions in advance til translucent and sweet. To avoid overcooking the chard, used tip from another CL recipe: cook the chopped stems for 5 min in salted boiling water; lift into ice bath, drain and then sauté with the torn leaves. Served with grilled steak & riced potato. Worcestershire in the chard made a good subtle pairing with the beef.