Tartine means – in general - a French open-faced sandwich, especially one with a rich or fancy spread.
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It comes from Old French, diminutive of tarte ( tart)
Here in my part of Switzerland it means mostly a slice of bread with something sweet on, jam, chocolate cream...
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This photo is not isolated,
but part of a thematic gallery
showing how to make jelly with a little help from my friends....

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to see all the other related pictures.