In a large heavy skillet, melt the lard over moderately high heat.

Lightly salt and pepper the lamb. Brown the lamb on all sides and reserve.

Lightly salt and pepper the pork. Brown the pork on all sides and reserve.

Cut the chiles into long ½-or ¼ inch strips, depending on their size.

Lightly sauté the chiles in the lard until they begin to wilt. Remove the chiles and reserve.

Add the stock to the skillet. Bring to a boil and reduce the heat.

Add the meats and simmer until tender.

Add the chiles and cook until heated through.

Fold in the zest and serve.