GREEN ENERGY

Hello people ,
I have a basic question . For office goers like me , break fast and lunch must be ready by 7 AM. So if i have to cook using solar cookers , i can do it only at noon . Is there any other energy efficient device which uses solar power for cooking where in energy can be stored in the batteries or else suggest some other way of cooking using green energy , this is one of my attempts to go green 🙂

Thanks in Advance !
Cheers .