Before heading off:
-In a bowl, add olive oil, lemon juice, salt and pepper. Mix it all together. Add the bird's eye chillies, after having cut them in two, removed the seeds and cut the flesh into small pieces (you can replace them with a little chilli powder or some drops of Tabasco). A few pinches of oregano or thyme. You can add lemon zest to it. Mix well.
-Cut up the chicken into pieces which will easily be able to be skewered by the kebab (for the grill: 3cm long is good!). Place them in the airtight zip bag.
-Then you just need to put the olive, lemon, chilli and herb mixture in the bag on the chicken, and reseal the bag, after having created as much of a vacuum as possible. Then shake the airtight bag so that the chicken is properly impregnated in the mixture.
-Leave to marinate for at least one hour, the time to pack everything away into the backpack and get to your barbecue spot*".