From Food & Wine. "The spinach filling in these fatayer, inspired by a recipe from Palestinian-born baker Maha Ziadeh, isn’t flavored with feta, as it is in the more common Greek spinach pies. Instead, it’s spiked with lemon and sumac, a tangy Middle Eastern spice. Ziadeh forms the pies into a triangle, but the half-moon shape here is simpler to do." The entire article is so inspiring- one woman helping immigrant women via baking bread. The yeast amount is correct.