Matters needing attention：
1 Knead A and B separately into dough.
2 Roll each out into 3mm-thick sheet. Put one upon another. Roll up and seal where sides meet with cylinder-shaped C stuffed inside.
3 Cut into 1cm-wide pieces. Stick every 6 together and shape.
4 Ferment for 10 minutes(30°C).
5 Steam for 8 minutes.