Prepare the vegetables: Dice tomatoes, cucumber, and green pepper. Slice the red onion thinly.
Cook the halloumi: Lightly grill or pan-fry the halloumi cubes until golden and slightly crispy on the outside.
Make the dressing: Whisk together olive oil, lemon juice, salt, and pepper in a small bowl.
Combine ingredients: In a large salad bowl, gently toss the vegetables, halloumi, and olives.
Add herbs and dressing: Sprinkle oregano or mint and drizzle the dressing over the salad. Toss gently to combine.
Serve immediately: Enjoy fresh or slightly chilled for the best flavor and texture.