If this happened to you, there are probably u003cstrongu003etwou003c/strongu003e reasons why it shrink in size or fall off: u003cbr/u003eu003cbr/u003eu003cstrongu003eA.u003c/strongu003e If your ground beef contains a high percentage of fats, it will shrink in size when steaming. To fix this, you should use lean ground beef- meaning the beef must have lower fat content. u003cbr/u003eu003cstrongu003eB.u003c/strongu003e If you are steaming at a high temperature, this will overcook your siomai, which will cause the meat to shrink and falls off. When using a gas stove, you should adjust to low heat temperature. u003cbr/u003eu003cbr/u003e