1. Whisk together lime juice and zest in a large heatproof bowl. In a small skillet, heat 5 tablespoons oil over medium-high. Add garlic and cook, stirring often, until light golden, 30 seconds to 1 minute. Whisk oil mixture into lime mixture; season with salt and pepper. Set aside 2 tablespoons dressing; add corn and tomatoes to remaining dressing and toss gently to combine. Season with salt and pepper.

2. Return skillet to medium-high heat and swirl in remaining 1 tablespoon oil. Add halloumi (be careful; it may splatter) and cook, flipping once, until golden and crisp on both sides, about 4 minutes total. Transfer to paper towels to drain.

3. Scatter arugula on a serving plate; top with corn-tomato mixture. Serve, with halloumi and reserved dressing on the side.