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Prepare a charcoal grill for two-zone cooking over medium-high heat by pouring the coals onto one half of the grill. For a gas grill, heat all of the burners to high, then turn off one of the end burners before cooking.
While the grill is heating, arrange the tomatoes on a platter with an edge to prevent leaking and season with 1/2 teaspoon salt. Drizzle with olive oil. Set aside. Pat halloumi dry and drizzle with olive oil to coat on both sides. Set aside.
In a small skillet over medium-low heat, toast the coriander seeds, cumin seeds and red-pepper flakes, shaking often, until fragrant, 1 to 2 minutes. Transfer to a cutting board and smash with the side of your knife until cracked. (You can also do this with a mortar and pestle.) Transfer to a small bowl, add the sugar, and rub with your fingers to further crush the seeds.
When you’re ready to grill, take the halloumi, tomatoes, seeds, tongs and a tightly folded paper towel soaked with olive oil to the grill. Clean the grates with a grill brush, then oil the grates with the paper towel. Grill the cheese over the flame, flipping halfway through, until well browned and it releases easily from the gates, 4 to 6 minutes total. (For a gas grill, close the lid between flips, listening and keeping an eye out for flare-ups.) If the cheese sticks to the grates, give it another minute on the heat. Transfer the cheese to the tomatoes, then sprinkle with the seeds. Season to taste with more red-pepper flakes, sugar and olive oil.