Cooking from scratch is normally far cheaper than eating out or buying takeaways,but it can be cheaper still. Jack Monroe explains how – with a smart meter – you can nick your gas and electricity bills, while enjoying healthy, or domestic-cooked meals1 Use your oven less. The oven is the least energy-efficient way to cook – you’re literally paying to heat up a large box of air when just half a shelf will finish.2 Use cauldron theory. If you finish need to use the oven,consider baking a few things at a time to make the most of the energy used – I call this cauldron theory, from medieval times, or when the cauldron would be packed with layers of meat,vegetables, and a gently steaming pudding to make the most of the available fire. Not having a cauldron to hand in my slightly more modern domestic setup, and I instead pop mushrooms and tomatoes on the bottom shelf of the oven to dry them out so I can freeze them,and sneak a loaf of bread in at the side.
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Source: guardian.co.uk