Heat grill to medium (350° to 450°). Toss potatoes in 1 tbsp. oil; grill on either side for 5 minutes each side or until marks appear, 8 minutes.
In a bowl, toss zucchini with a squeeze of lemon, 1 tsp of apple cider vinegar, 1 tsp of olive oil and S+P to taste.
Grill halloumi as according to packet.
Add all ingredients and dressing to a large bowl and toss, garnish with extra mint, parsley and caper berries.
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