The phrase "to caramelize the nuts" means to cook the nuts with sugar until the sugar melts and turns into a sweet, sticky coating on the nuts. Full definition
Add caramelized nuts - they will stick well to the frosting. (myberryforest.com)
As with most baked apples, this is simple to make, with the added crunch of caramelized nuts on the side and a dollop of honeyed yogurt. (mixedgreensblog.com)
Dip the pieces of caramelized nuts in chocolate and place on a tray lined with baking paper to solidify. (lilcookie.com)