Same as tostato, usually referring to bread or bread crumbs (pangrattato abbrustolito). Some other meanings:
Riso abbrustolito is fried (or baked) rice, what you do with your leftover risotto. Brodo abbrustolito is a simple broth made from a roux. With vegetables it usually means roasted, as with that antipasto favourite peperoni abbrustoliti.
brut brusat: cornflour toasted in butter, then boiled (Friuli)
Image by Bruce