Mix the olive oil with soda water in a small bowl.
Line one large sheet tray with silicon paper.
Lay one sheet of filo on a clean work surface and then drizzle 1-1 ½ tablespoon of the sauce, spread it evenly using a brush.
Lay another sheet of filo on top and drizzle some more sauce, and spread it evenly. Repeat the same steps until you have three sheets of filo.
Place a piece of kofte on the short side of the filo sheets and start rolling them tightly into a log shape.
Cut the log diagonally into eight equal pieces and place them on your paper-lined tray.
Repeat the same steps with the remaining filo sheets and koftes.
Brush the pastries with melted butter to help them brown nicely.
Bake them for 20 minutes or until the pastries are golden brown.
Prepare the tomato sauce while the kebabs are baking.