Mix the chopped chile and olive oil in a small bowl or cup and leave the flavors to deepen while you cook the cheese. I use a nonstick frying pan for this, without any oil, and just give the cheese slices about 2 minutes a side until they're golden brown in parts. When all the slices of halloumi are cooked, transfer them to a couple of small plates. Give the chile oil a stir, spoon it over the cheese, then give a spritz of lemon. That's all there is to it.