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1 Grip the avocado gently on one side with one hand. With a large, sharp knife in the other hand, cut the avocado lengthwise around the seed. Open the two halves to expose the pit.

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hold the avocado half with the pit. Gently tap the pit with a knife with enough force so that the knife edge wedges into the pit, but not so hard as to cut all the way through it.
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With the edge of the knife, twist the pit out of the avocado and discard.

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3b To make avocado slices, use a knife to slice the inside of the avocado halves into sections. Don't worry if you cut right through the peel.

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4 Use your fingers to separate the avocado segments from the peel.

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Links:
What's in a Name? The Avocado Story - how the avocado got its name, from NPR
www.avocado.org's Guacamole Central - more versions of guacamole