Rinse 2 cups glutinous rice thoroughly under cold water until water runs clear. Soak rice in cold water for 4 hours or overnight, then drain completely.

Prepare the eight treasures by soaking dried lotus seeds, red dates, goji berries, and raisins in warm water for 20 minutes. Drain and pat dry. Chop larger fruits into bite-sized pieces.

Grease a heatproof bowl or pudding mold with butter. Arrange the eight treasures in a decorative pattern on the bottom and sides of the bowl, pressing them gently to adhere.

In a mixing bowl, combine the soaked glutinous rice with 3 tablespoons melted butter, 2 tablespoons honey, and a pinch of salt. Mix well to coat the rice evenly.

Carefully spoon the rice mixture into the prepared bowl, pressing down gently to pack it firmly without disturbing the arranged fruits. Smooth the top surface.

Pour 1 cup of water mixed with 1/4 cup honey over the rice until it just covers the surface.

Place the bowl in a large steamer basket over boiling water. Cover and steam over medium-high heat for 75-90 minutes, checking water level periodically and adding more boiling water as needed.

The pudding is done when the rice is completely tender and translucent, and the liquid has been absorbed.

Remove from steamer and let rest for 10 minutes. Run a knife around the edges, place a serving plate on top, and carefully invert to unmold.

Serve warm, optionally drizzled with additional honey or sweet osmanthus syrup.