Add the meat and brown it well over medium heat.

Add tomatoes, cover and cook over medium heat about 30 minutes.

Add mussels, cover and cook over high heat until they open, 8 minutes.

When oil is very hot, add meat and cook over moderately high heat for 5 minutes or until brown.

Add remaining oil and the egg to pan, still over high heat.

Add onion and cook over medium heat until just golden.

Add mussels, cover and cook over medium heat until they open, about 10 minutes.

When the oil is hot, add the slices of meat and cook over medium heat about 5 minutes or until brown.

Add potatoes and saute over medium heat until they begin to color.

Add half-and-half and cook over high heat about 1 minute.