If you do not have an LPG cylinder and have run out of gas, then food can be cooked using other things like induction microwave, solar cooker or electric kettle.
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Induction stove is the best option, it cooks food quickly and is also quite safe.
There is plenty of sunshine in the summer season. If you want, you can also buy a solar cooker. There are many types of solar cookers. Boiling is done easily in a box solar cooker. Whereas frying and roasting can be done in parabolic solar cooker.