1. Preheat oven to 350 degrees Fahrenheit.
2. Roll out dough thinly to form a large rectangle. (It is much easier to roll out the pizza dough, the challah dough is much more challenging).
3. Mix together halva, brown sugar, vanilla, cinnamon and pecans.
4. Spread over rectangle. Roll up so it’s long and thin (as opposed to short and thick). Slice down the middle to form two even skinnier ropes and twist them together.
5. Brush exposed dough with silan.
6. Bake for about 30 minutes.