1. Preheat oven to 325 degrees Fahrenheit. Spread the nuts out onto a rimmed baking sheet. Roast for 8 to 10 minutes, until fragrant and toasted. Allow to cool for 2 to 3 minutes on the tray.
2. Immediately add the nuts to food processor while they’re warm and process for 4 minutes. You’ll see them start out crumbly, then get gradually creamier and creamier.
3. Add the kosher salt to taste (between 1/8 to 1/4 teaspoon using unsalted nuts). Process for 2 to 3 minutes more until luxuriously creamy. Taste and add additional salt as necessary.
4. Transfer the cashew butter to a jar. Store in a cool dark place (pantry) for 1 month or refrigerated for 2 to 3 months.