Don't forget to stir continuously. Decorate the edges. Halvah can be served warm or cold. The mixture of the flour depends on your preference. The more all purpose flour you use, the smoother the Halvah would be.
Some people like their Halvah to be a little gritty and they use more whole wheat.
You can also include some rice flour. It does not affect the taste too much, just the texture. Traditionally, Halvah is supposed to be oily.