burn
cinder
Allow the onions to caramelize, but don't burn them to a cinder.
They have cut down ancient forests, and burned the undergrowth to a cinder.
This meat is no good -it's burnt to a cinder!
SMART Vocabulary: related words and phrases
Products of fire
ash
ashy
belch
cinder
clinker
ember
fumes
haze
smoke
smokeless
smokily
smoky
smut
soot
sooty