Finnish word paahtoaste comes from Finnish aste, Finnish paahto

Detailed word origin of paahtoaste

Dictionary entry	Language	Definition
aste	Finnish (fin)	(everyday usage) degree, degree Celsius (short for celsiusaste). Degree. Grade. Order.
paahto	Finnish (fin)	(as modifier in compound terms) roast, roasted, toasted. Roast (degree to which something is roasted).
paahtoaste	Finnish (fin)	Roast (degree to which something is roasted).