Grill the halloumi by placing the sliced halloumi onto a hot pan and flip occasionally until the cheese is brown; toast the bagel by placing on a hot pan until brown.
Cut the tomatoes and mash the avocado’s (add a squeeze of lemon and pinch of salt to the avocado).
Assemble the bagel by spreading the avocado on the toasted bagel, add on the slide tomato, grilled halloumi and top with spinach.