Place the ground chicken in a large bowl. Grate the onion using a blender or grate and add to the bowl with salt and pepper. Add saffron to the bowl and mix them well with your hand until it starts to look like a paste and stick to your fingers. Spread and flatten the chicken mixture across a large grill pan and place the pan on stove over medium heat. You don´t need to add oil yet. Note that you want to have a thin layer in the pan as it gets thick when cooked. Cover the lid and allow the kebab on medium heat for 3-4 minutes until you see the kebab is getting juicy. Lower the heat and cut the meat lengthwise into strips. Allow it to simmer over low heat for 30 minutes Add vegetable oil. allow one side to fry, then turn the strips so both sides brown slightly.Serve warm