Preheat oven to 375 F.
Mix all the semolina cake ingredients together other than the tahini and crushed pistachios in a large bowl with a spatula.
Prep a 12-inch round baking pan or 9 by 13 pan by brushing it entirely with the tahini paste.
Add half the batter to the pan and spread it out evenly.
Top that off with the date paste by taking a piece of the baking date paste and flattening it out with your hand then placing on top of the first layer of batter. Keep repeating this until a layer of date paste is on top of the semolina batter. Leave 1-2 inches around the edges without being covered with dates. The paste should be 1-2 inches thick; not more than that.
Top the date paste layer with a sprinkle of cinnamon and the crushed walnuts.
Then, add the second half of the semolina cake batter on top and spread it out to cover the entire pan.
Etch a design using the back of a butter knife onto the top or just cut into a diamond or square design before and/or after it is baked and cooled. I personally etched the design I wanted as a template before baking then cut it after it finished baking following the patterns.
Bake in the preheated oven for 30-35 minutes then broil for1 minute for a light brown color on top.
Glaze the top a few times with the simple syrup then garnish with the crushed nuts. Serve warm or room temperature. Add more syrup to your liking if necessary.