2. Hemp is a kind of food made of glutinous rice. The general way of eating is frying. So how long can you eat it when you put it in the microwave oven? Don't take too long. It is easy to harden after heating for a long time. You can also sprinkle a few drops of boiling water in it, so that it won't dry easily. Putting the sesame paste on a plate and then steaming it in a steamer is the best heating method.