Wash chard thoroughly. Separate leaves from the stalks. Remove woody part of stalks (if any) and cut stalks into 1-inch pieces. Tear or roughly chop leaves into about 2 inch pieces.
In a large skillet on medium high, heat oil. Add stalks and cook for 3-4 minutes, or until slightly tender.
Add garlic and leaves, then turn heat down to medium-low. Cook for 3-4 minutes, stirring often, or until leaves are wilted and stalks are tender.
Drain any excess liquid. Add lemon juice, salt, and pepper. Season as desired and serve.
Notes
Store leftovers in the refrigerator for up to three days.
Swiss chard may be added to soups, stews, or casseroles.