noun, masculine/ɡʁa.jɔ̃/plural: graillons
grilled flavor; taste or scent of burnt grilled meat or fat; leftovers from a meal, collected and resold
From Old French graïllier, graeillier (“to roast on a grill”) + -on. See griller (“to grill”). Analyzable as grailler + -on, though according to the TLFi, the latter is formed from the noun.