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  • Should I use just enough boiling water from the kettle to cover them (less water to bring back to the boil) or fill the saucepan right up (more water, but it won't have been cooled as much by the peas)

    Your mission is to heat peas, not water. Minimum quantity is the way to go.

  • Your mission is to heat peas, not water. Minimum quantity is the way to go.

    Surely that depends on whether you want to heat them quickly or efficiency.

  • depends on whether you want to heat them quickly or efficiency

    Since your energy flow rate is limited by the equipment you have at hand, the fastest method is also the most efficient, and vice versa. The only thing which would alter that would be an efficiency difference between the method used to heat a batch of water and that used to reheat the mixture peas-in-water.
    On the other hand, what kind of efficiency? An electric kettle is more thermally efficient than a gas hob, but my utility company is charging nearly 4 times as much for electricity as gas, so gas is more economically efficient.

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