Sfouf is a plural (meaning "rows", referring to how they're cut), just like "brownies", and as much a classic of Lebanese homebaking as brownies are in the US.
Sfouf have a dense texture, are not too sweet (at least with this recipe), and have a startling yellow colour due to the turmeric, which also gives them a particular taste hard to describe. To make them more nutty, you can pour half the batter into the pan, sprinkle nuts liberally, then pour the rest of the batter on top.