Take 1 phyllo pastry sheet, smear it with the butter, fold it in 2 widthwise so that the butter remains inside.
Put a little of the filling at one end, then wrap it into a roll. Do this for all of the sheets.
Smear the tray with oil, arrange the phyllo pastries in it, smear them with the remaining butter. Pour in water. Bake at 392°F (200 °C) until reddened.