1. Cut the meat into small dice.
2. In a bowl, mix together the egg yolk, Dijon mustard, Worcestershire sauce, ketchup, Tabasco, salt, and pepper.
3. Add the olive oil while whisking.
4. Add the meat to the mixture along with the parsley.
5. Adjust the seasoning if necessary.
6. Refrigerate or serve immediately.
This dish can be prepared up to 2 hours in advance.