Trim and discard fat from pork; cut pork into 1-inchcubes.
Heat oil in a wide 3 to 4 quart pan over medium-high heat. Add meat, a few pieces at a time, and cook until lightly browned on all sides. Lift out meat, transfer to a plate, and keep warm; reserve drippings in pan. Add onion to pan and cool, stirring, until soft (about 7 minutes).
Return meat to pan and stir in garlic, tomatillos, chiles, marjoram, chopped cilantro, and water. Season to taste with salt. Cover and simmer until meat is tender when pierced (about 1 hour). Skim off fat. Spoon into serving bowls and garnish with sour cream and cilantro sprigs.
The owner of this pot de creme cup describes it as being from the Napoleon III era from the Sevres factory in France