Combine all of the ingredients into a large bowl and mix well to ensure there are no lumps.
Set up a large wok with a steamer rack, and bring water up to a boil.
Line a cotton cloth onto a stainless steel pan and place it on top of the steamer rack.
Stir the batter well so that there are no lumps and scoop 1 ladle onto the cloth.
Cover the wok with a lid and steam for 1-2 minutes, until the rice noodle puffs with bubbles, meaning that it is ready and cooked through. [If you want to add fillings, add it in after ladling in the batter].
Lightly grease a chopping board with some oil and transfer the cloth with the rice noodle to it.
Carefully peel the cloth away from the rice noodle using a dough scraper, and roll/fold into a long cylindrical shape.
Repeat with the remaining batter.
Garnish with green onions and sesame seeds. Serve immediately with sweetened soy sauce.
Make Sweetened Soy Sauce:
Place all of the ingredients into a small saucepan and bring to a boil.