Bring a small pot of water to a boil over medium-high heat
Place almonds into the pot and boil for one minute.
Strain and rinse the almonds under cold water.
The skins of the almonds should be loose and shriveled. Gently squeeze the almonds out of their skins, placing them onto a paper towel-lined plate. Allow the almonds to dry completely before using them.
Paste
Place almonds and ½ cup of the confectioners' sugar in the bowl of a food processor. Process on high until finely ground, scraping the bowl as needed.
Add remaining sugar, egg white, almond extract, and salt. Process until the mixture comes together, scraping the sides as necessary. The texture will be similar to looser playdough and is a light tan in color. (If it is too sticky, add more confectioners' sugar, one tablespoon at a time, until the paste has reached your desired consistency.) This will make 1¼ cups (392 g) of paste.
Tightly roll the paste in a sheet of plastic wrap. Store in the refrigerator for up to a month or in the freezer for up to 3 months.
Notes
*This recipe makes approximately 1 1/4 cups of almond paste.