Total:  80 euro....

Most simple

Tea filter

Hi Franco. Looks interesting. What is the purpose of 'burning air'?
Do you mean it will produce an actual flame of some type at the nozzle at the top?
All you need to do is apply a high DC voltage, plus to the tea bag filter and minus to the barbecue body?
How do you get the air to start burning?
With no explanation, I am not sure what you are trying to achieve.

Also curious as to what this helps to do in terms of energy consumption.