In a large, deep cast-iron pot, melt lard over high heat. Once hot, carefully add the pork shoulder pieces with 1 whole onion (cut in half), the garlic head (cut in half horizontally), and bay leaves.
In a cup, mix salt and ½ cup of water. Add to the frying oil.
Sear the meat, turning occasionally, until golden brown on all sides, about 30 minutes. When the lard reaches a boil again, add the pork short ribs. Fry until the ribs are golden brown, about 10 minutes.
Simmer the carnitas. Cover tightly (foil may help seal) and reduce the heat to low. Continue frying over low heat until the meat is fall-apart tender, about 2 hours. Stir every 30 minutes with a wooden spoon to prevent sticking or burning. Once cooked, remove and drain. Once cooled, shred the carnitas.
For the Pico de Gallo, dice tomato, onion and cilantro. Mix together. Set aside.
For the Cilantro Avocado Lime Dressing, add avocado, lime, mayonnaise, serrano, chicken bouillon, onion and garlic. Blend and pour into a squeezable jar.
To serve, add the Fresh Express® Hearts of Romaine Blend to a bowl and top it off with carnitas, Pico de Gallo and a generous amount of the cilantro avocado lime dressing. Y Listo!