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In a blender, put the yogurt and strawberries (in that order, otherwise the blender might spin without being able to blend the mixture).
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Process until you obtain a smooth paste.
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Taste and add sugar if necessary (remember that cold things taste less sweet).
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Put the mixture in a freezer-safe container. Personally, I like to use a rectangular loaf pan.
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Cover with plastic wrap, and it's VERY important that the mixture touches the plastic wrap; otherwise, ice crystals will form and the mixture won't be creamy.
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Freeze for at least 3-4 hours.
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Remove from the freezer and let it sit at room temperature for 5-10 minutes minutes, depending on the room temperature.
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Remove the plastic wrap and use a fork to "scrape" the ice cream to loosen it. Make scoops of ice cream, serve, and enjoy!