In a small bowl,add hot water,saffron and mix well,let it soak for 15-20 minutes.
In a wok,add & spread sugar and cook on very low flame until sugar is caramelized (14-15 minutes) and mix until sugar melts & turns brown.
Add tahini paste,saffron water & mix until well combined (2-3 minutes).
Grease silicon mat with cooking oil & transfer prepared mixture on it.
Sprinkle pistachios,press & spread gently with the help of rolling pin.
Let it set for 4-6 hours then break into pieces & serve!