Wash, rinse then soak the 5 cups of glutinous white rice in double the amount of water in a bowl or large container overnight (about 8-12 hours). Drain.
PREPARE THE MOCHI MAKER by filling it with 2 cups of water (there is a separate area for this, right below where the steamer bowl should be placed).
Fit the bowl and paddle into the machine
Transfer the drained rice into the steamer bowl.
Close the lid and press STEAM (takes about 30 minutes, an alarm will go off when it's done)
As the mochi maker steams the rice (which takes about 30 minutes), PREPARE THE MUGWORT: by either (1) blanching it in boiling water for 1 minute or (2) microwaving it for 1 minute. Drain excess water and chop roughly using a sharp knife. You should get about 1 cup of cooked/chopped mugwort**
Add the salt, sugar, drained mugwort and water as the rice starts mixing. Use ⅓ cup water for a chewier mochi, or ½ cup water for a softer, more flexible mochi.*** You can also add mugwort powder if you don't have fresh mugwort.
Allow the mochi machine to pound the rice for 15-20 minutes and stop the machine. Pour into a well greased pan.
Use the mochi dough immediately to shape into desired shape or fill with sweetened bean paste.
I've used a perilla (sesame seed) leaf to wrap the mugwort mochi in the photos