Three simple tools worth having

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Cast iron pan
Holds heat evenly, which is what searing needs. It lasts for years if you dry it after washing and wipe it with a little oil. It is heavy, so check you are happy lifting it one-handed.
Lodge cast iron pan on Amazon UK
Fine zester
Lemon zest adds brightness to fish, salads and butter with almost no carbs. Zest only the coloured part; the white pith is bitter.
Microplane lemon zester on Amazon UK
Oil spray bottle
A fine mist covers a pan or a tray of vegetables with far less oil than pouring. Use plain oil and clean it regularly.