Season the beef cheeks with salt and pepper and dust with flour. In a very hot pan, sear the cheeks in extra virgin olive oil for a few minutes until brown. Once browned, remove from the pan and transfer to a casserole dish. Add the garlic, thyme, red wine, stock, salt and pepper, and put in the oven (cover the dish with a sheet of grease proof paper, and then a lid) at 160°C for 1hr 30 minutes, until tender. Remove the cheeks and let the jus reduce further on the hob until nice and gooey.