That's because it is difficult to transfer the heat of the pot to the wax gourd without water, so that the wax gourd next to the bottom of the pot is burnt, but the wax gourd above is still hard!

After putting water, it is different. The heat of the pot can be quickly and evenly transferred to the wax gourd through the convection of water, and the cells of the wax gourd will soon rupture because of the high temperature, so that a large amount of water in the cells will come out.