What is the name of the round, black pastry with a sesame seed gooey surface?

Donkey roll. Donkey roll practice is to add 80g of glutinous rice flour + sugar 10g + water 100g in a bowl, and mix well steamed, put sesame seeds will be, and then put some sesame seeds, so it is donkey roll. Pastry is a kind of food. It is based on flour or rice flour, sugar, grease, eggs, dairy and other main ingredients, with a variety of accessories, fillings and flavorings.