When the oil is hot, add the butter and when nutty brown, add the well seasoned chicken breasts, skin side down. Cook about 2 minutes and turn, then cook a further 3-4 minutes on the other side.
Remove from the pan and rest while you make the tzaziki.
To make the tzaziki, place the yoghurt in a bowl with the lemon juice, salt and lots of freshly ground pepper.
Press the excess juice out of the cucumber and add it to the yoghurt with the well crushed garlic.
Check the balance and finish by adding the mint.
Plate up the chicken breasts, place the tzaziki on the side and drizzle a little extra virgin olive oil over the top.