Peel garlic. Add it to a small mortar-pestle and crush it coarsely. Add 1 teaspoon olive oil to it and leave it for a few minutes.
Cut halloumi cheese into 1/2-inch slabs. Place them on a tray and coat all sides of the cheese with a thin layer of olive oil.
Heat a seasoned cast iron pan until it is hot. Add 2 teaspoons olive oil and brush it around the pan. Place the halloumi slices on the pan, making sure they are not sticking to each other. Allow one side to grill for 3-4 minutes. Resist the temptation to turn it over too quickly.
When the first side is nicely browned, flip each of the halloumi slices carefully.
While the second side is grilling, add the oil-infused garlic pieces over each of the halloumi slices. Allow the second side to grill for another 3-4 minutes or until that side is nicely browned.
Flip the first side back along with the garlic pieces - don't worry if they drop down on the pan. Allow everything to brown for a minute.
Remove the halloumi cheese slices along with the browned garlic pieces and leftover olive oil, on to a serving tray. Serve hot! Watch out for requests for seconds. And be sure to bask in the compliments that will follow.