Since wrapped oomlies cannot be cooked until level 50 Cooking, burnt oomlie wraps cannot be obtained via normal means. However, one method is known through which it is possible: by making use of the chilling effect which provides a temporary skill drain.
This method relies on the player being at 1 hitpoint for the duration of the cooking process, as the cold will not cause damage with only 1 hitpoint remaining. Should hitpoint regeneration occur, damage will be taken, and the action will be interrupted.
Draining from 50 to 43 cooking takes 70 ticks, or 42 seconds. Since cooking takes 4 ticks, you are guaranteed to successfully cook the first 18 wraps. After one minute you regenerate one hitpoint and the next cold tick will interrupt the cooking. This gives you at most 40 ticks of cooking with a burn chance, or at most 10 wraps per attempt.
In order to carry 27 wraps and also light a fire, drop your logs on the ground, bank, and finally use the "light" option on the logs. Alternatively, you can bring logs, equip a bow, drop the logs, unequip the bow and use it to light the logs when you have completed Barbarian firemaking.
As a fire can start burning out after one minute, light the fire as late as possible. Coloured logs are helpful in this regard, as they can be reliably lit on the first attempt even at level 1 Firemaking.
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