Mash the onion and garlic together. Melt the lard in a frying pan and add the raiyu. Put in the onion/garlic mixture and sauté for 2 to 3 minutes. In a small bowl, combine the misos, soy sauce and sesame oil. Add to the frying pan and cook over medium heat for 5 to 10 minutes, stirring occasionally, until thickened and bubbly. Set aside to cool. If refrigerated, it will keep for a few days.