Mix marinade ingredients together in a cup or bowl, stirring to dissolve the sugar. Pour over the steak(s), turning meat to coat. Set in the refrigerator to marinate.
For the ground sticky rice (instead of peanuts): Place 2 Tbsp. uncooked sticky rice in a dry frying pan over medium-high heat. Stirring continuously, dry-fry the rice until it starts to pop and is lightly toasted. Remove rice from the pan and allow to cool slightly before grinding it up with a coffee grinder, or pounding into a powder with pestel & mortar