פירוש על עבודה זרה 75:6

According to Rav, if a non-Jew sets fire to the ground and the fire roasts some locusts the locusts may not be eaten.

The problem with Rav’s statement is that we can assume the non-Jew burned the ground of the uncleared field not in order to roast the locusts but in order to clear the ground. In cases like this, where the intention was not to cook but to clear some unwanted thing away, the cooked food should not be prohibited.