Method
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1
Make the sugar syrup: Put the 125 grams caster sugar, 1 teaspoons vanilla extract, 2 lemon zest strips and 200 milliliters water into a small saucepan and slowly bring to the boil, stirring occasionally, until the sugar has dissolved.
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2
Simmer the syrup: Simmer gently for 5 minutes until slightly thickened, then remove from the heat and leave to cool completely — pop it in the fridge to speed this up if you're short on time.
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3
Purée the strawberries: Put the 500 grams strawberries, hulled and roughly chopped in a food processor or blender and whizz until smooth.
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4
Combine the base: Pour the strawberry purée into a bowl, add the 500 grams Greek yoghurt and 4 tablespoons crème fraîche, and mix until smooth. Strain the cooled sugar syrup into the mixture (discard the zest strips) and whisk to combine.
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5
Chill before freezing: Cover and chill the mixture in the fridge — starting it cold means it freezes faster once it's in the freezer, which is one of the biggest factors in keeping ice crystals small.
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6
Freeze thin and flat: Pour into a large ziptop bag (or a shallow freezer-safe container), squeeze out all the air and seal. Freeze lying flat in as thin a layer as possible — a thin layer freezes much faster than a thick one, and speed is what keeps crystals small.
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7
First blitz: Remove from the freezer and break into chunks small enough to fit your food processor or a high-powered blender. Pulse until completely smooth — don't over-process, just enough to fully smooth it out.
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8
Re-freeze shallow: Spread into a shallow, lidded container. Press a piece of cling film directly onto the surface (this stops a crusty, crystalline layer forming), cover with the lid and freeze until firm again.
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9
Second blitz: Break into chunks again and pulse briefly until smooth. This second 'churn' is what really transforms the texture from icy to properly creamy — don't skip it.
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10
Final freeze: Return to the container, press the cling film onto the surface again, and freeze until scoopable.
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11
Soften and serve: Transfer to the fridge to soften for 15–20 minutes before scooping and serving.