How to cook a fresh chicken soup on Shabbos morning

לא תבערו אש בכל משבתיכם                                  How to cook a fresh chicken soup on Shabbos morning   1) One may not cook with תולדות חמה. e.g. Cooking an egg in a pot that was heated up by the sun. (egg heated by the pot)   2) One may cook with חמה e.g. Placing an egg under the sun. (egg heated directly from the sun)  **According to Mori V'Rabi Harav Hagaon R. Shlomo Miller Shlita, One may place food under the sun and have a magnifying glass directed at the food (not at the pot). Since the food is being cooked directly from the sun it's בישול בחמה which is permissible. The magnifying glass just increases more sun. \   *ספר שבת שלמה מאת הרה"ג עזריאל יהודה געשטעטנר שליט"א\