This one goes to 11.
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Pour 500 ml fresh heavy cream into a clean glass jar or bowl. Add the 2 tbsp yoghurt (live culture) and stir well to combine. Cover the jar loosely with a clean cloth or lid, allowing air to circulate.
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Leave the cream mixture at room temperature (ideally around 20–22°C) for 12-24 hours, until it thickens slightly and develops a tangy aroma. The longer it ferments, the more pronounced the flavour.
The tanginess and richness come from the cultured cream. Adjust the fermentation time to suit your taste.
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Once cultured, refrigerate the cream for a few hours until it’s well-chilled. This helps with the butter churning process.
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Pour the chilled cultured cream into a stand mixer or food processor. Whip on medium-high speed until the cream separates into butter and buttermilk. This can take 5-10 minutes. First, it will become whipped cream, then grainy, and finally, the butter solids will clump together, leaving liquid buttermilk.
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Strain off the buttermilk. Gather the butter solids and gently squeeze out excess liquid.
Use the leftover buttermilk in pancakes, scones, or baking recipes.
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Rinse the butter under cold running water or in a bowl of ice water. Knead it gently to remove residual buttermilk, which helps extend shelf life. Repeat until the water runs clear.
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If desired, add 1 pinch sea salt and knead it evenly into the butter.
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Shape the butter into a block or place it in a container. Store in the fridge for up to two weeks or freeze for longer storage.