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1
Toast sesame seeds in a dry skillet over medium heat for 3–4 minutes, shaking frequently, until fragrant and lightly coloured; transfer to a bowl.
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2
Crumble dried oregano with your hands into the bowl, breaking larger pieces into manageable fragments.
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3
Add coarsely ground Aleppo pepper, sumac, and dried thyme to the bowl and stir to combine evenly.
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4
Fold in fine sea salt and mix thoroughly.
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5
Transfer to an airtight container and store in a cool, dark place for up to 2 months; za'atar fades quickly, so replace seasonally for optimal colour and flavour.