Original sentence: A marshmallow is placed on the end of a stick or skewer and held carefully over the fire until it is burnt.According to individual preference, the marshmallows are heated to various degrees —
Edited sentence: A marshmallow is placed on the end of a stick or skewer and held carefully over the fire until it turns golden brown or is burnt.According to individual preference, the marshmallows are heated to various degrees — from gently toasted to a charred outer layer