Preheat the oven to 400 degrees Fahrenheit.
Dice the halloumi and vegetables roughly into even sized chunks – about 1.5 inches. Arrange across a sheet pan and season with salt and pepper.
Add the harissa, olive oil, lakanto and lemon zest to a small mixing bowl. Stir well to combine.
Drizzle the harissa mixture over the vegetables and halloumi and use your hands to rub in the marinade.
Transfer to the oven to bake for 15-18 minutes until the vegetables are tender and the cheese is golden, turning halfway through cooking.
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