Prepare the Chard: Heat water in a pot and blanch the chard leaves until they are soft but not overcooked. Then drain them to have them ready for rolling.
Prepare the Filling: On each chard leaf, place a slice of ham and a piece of cheese. Fold them into rolls.
Make the Broth: In another pot, cook tomatoes, guajillo chilies, a piece of onion, and garlic cloves in water. Once cooked, blend these ingredients into a smooth sauce.
Cook the Sauce: In a saucepan, heat oil and sauté slices of onion until fragrant. Add the blended sauce, season with salt, and add a little water if needed. Let it simmer until it thickens.
Finish the Dish: Once the sauce is boiling, add the chard rolls into the sauce. Let them cook for a few minutes until the dish is heated through and the flavors meld.
Serve: Serve the chard rolls hot with rice or your choice of side. Enjoy your meal!