When the caramel is a pale to medium yellow, less than 1 minute more, add the warm nuts. With a heatproof silicone spatula, stir gently and slowly to coat the nuts with caramel. Continue to cook until a bead of caramel dribbled onto a white plate
is reddish amber, about 1-1/2 minutes more. Immediately scrape the mixture onto the baking sheet and spread it as thin as you can before it hardens. When the caramel is slightly cooled but still warm, slide the foil with the caramel nuts into a zip-top plastic bag and seal the bag. Cool completely. Chop or crush.