Place lard in a pot and heat until melted. Once hot, add the onion cut into quarters and sauté for a few minutes, add the tomato cut into halves and continue cooking until the tomato changes colour and begins to reduce in size.
Add the garlic and continue cooking. Meanwhile begin to toast the sesame in a frying pan. Once golden, add it to the pot with the sauce, then toast the seed and add it to the preparation, taking care to toast the seed and sesame separately since they each have different browning times. Once you have your sauce with the seeds and sesame, add a little salt and cook it for another 5 minutes, all the preparation is over low heat, add a little water if necessary, then add the leaves to the preparation and remove it from the heat, mix well and let the leaves cook for a few seconds.