Tapa + Sinangag + Itlog (dried meat + fried rice + egg)
Tapsilog is a hearty breakfast combination that’s a favorite of Filipinos. This is one of the most popular — if not the most popular — of the -silog series of meal combos.
— 🙃 (@TAOCOS) February 3, 2016
The misspelling topsilog arises from the pronunciation.