In a mixing bowl, whisk together the lemon juice, hot honey, apple cider vinegar, Dijon mustard, garlic, salt, and olive oil until emulsified. Set aside.
In a large serving bowl, layer the mixed greens, cucumber, tomatoes, and sliced onion. Sprinkle about ¾ cup of the pomegranate seeds over the top and set aside.
Heat a grill pan over medium-high heat. Add 2 tablespoons of olive oil and brush it into the grooves so the surface is fully coated. Once hot, place the halloumi slices in the pan and brush the tops with a bit of olive oil to prevent sticking when flipped.
Cook the halloumi for 3 to 4 minutes per side. Gently lift a corner to make sure they are golden brown. Flip the slices of halloumi and continue cooking for an additional 3 to 4 minutes.
Reduce the heat and brush the hot honey glaze over both sides of the grilled halloumi slices. Cooking for 1 minute on each side.
Give the dressing a quick stir and pour it over the salad. Top with the warm grilled halloumi, avocado slices, and garnish with the remaining pomegranate seeds, if desired.
Serve immediately, with an extra drizzle of hot honey.