The little golden dumpling is filled with yellow dumplings. He bites the yellow dumplings and spits out the white beads. This is a riddle, and his answer is orange.

The outer skin of the orange is yellow, and the entire shape of the orange is round. This is the "little golden dumpling" in the riddle. The orange slices inside are shaped like dumplings, and the color is also yellow. This is the "little golden dumpling" in the riddle.

"Yellow dumplings"; some oranges have seeds in them, and the seeds are white and round, which are the "white beads" mentioned in the riddle.

The answer to this riddle can also be said to be tangerine, which is almost the same.

So the answer to the riddle of filling the little golden dumplings with yellow dumplings and spitting out white beads when you bite the yellow dumplings is orange or tangerine.