broil vs burn to a crisp

broil

verb

To be exposed to great heat.
To expose to great heat.
To cause a rowdy disturbance; embroil.

noun

Food prepared by broiling.

burn to a crisp

verb

To burn (usually food) very severely.

How often have the words broil and burn to a crisp occurred in a corpus of books? (source: Google Ngram Viewer )