Add the almond flour, powdered sugar and salt to the bowl of a food processor fitted with its blade. Use a spoon to stir the ingredients a bit.
Pulse the almond flour mixture briefly to combine further. Stop the machine to scrape down the sides with a plastic spatula as needed.
Separate the egg white from a large egg. (Store the yolk in the refrigerator for another use.) Add the egg white and almond extract to the food processor bowl. Pulse the machine again until the almond paste comes together in a ball.
Scrape out all of the almond paste from the food processor and shape it into a log. Place the log onto a sheet of plastic wrap. Wrap the paste tightly and then place it in a zip-top plastic bag (or double-wrap it). Refrigerate it until you're ready to use it.
Store the almond paste in the refrigerator for up to a month or in the freezer (use a freezer bag) for up to three months. Let it come to room temperature before using it.
Notes
Almond Flour consists of ground, peeled almonds sifted into a fine powder.
We have not tested this recipe with almond meal, which is made from ground almonds with skins.
Store almond flour in the freezer to maintain freshness. It can be used right out of the freezer.
If you need to cut this recipe in half, still use one large egg white but halve the remaining ingredients.
Nutrition information provided is for one ounce of almond paste.