Clean each chard leaf from very ruined or rotten leaves. Cut out the earthy ends and wash them in a bowl of water with a mixture of baking soda and vinegar (about 1/4 cup of each).
Rinse clumsily (we need leaves wet).
Place them in a large and tall skillet, add and mix them with the extra-virgin olive oil and two pinches of salt.
Cover and turn on the heat (medium).
After 5 minutes check: if the stems are fork tender, your chard is perfectly cooked.