Gently clean the banana leaves with a damp cloth and cut them into 9x6-inch rectangles. Set them aside for wrapping.

Rinse the glutinous rice flour thoroughly, ensuring it's clean and ready for the next steps.

In a large pot over medium heat, combine coconut milk, sugar, and a pinch of salt. Stir until the sugar and salt are completely dissolved. Add the glutinous rice to the mixture.

Bring it to a simmer, then reduce the heat to low, cover, and let it cook until all liquids are absorbed. Add water if needed, ensuring the rice is almost cooked but not fully. Let the rice cool down a bit for easier handling.

Scoop about 2-3 tablespoons of rice onto a banana leaf and roll it into a thin log. Fold 2 inches of each end towards the middle to enclose the rice. Repeat this process until all the rice is used.

Place the rice logs in a steamer basket, fold side down, and steam for approximately 30-45 minutes.

Once steamed, allow the suman to cool. Unwrap the banana leaves and transfer the suman to a serving plate. Serve these delightful treats with sugar or a luscious latik sauce.