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1
Season the fish with the grated lemon zest, thyme and parsley. Cover and refrigerate for 3-4 hours.
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2
Remove the fish 20 minutes before you start cooking to bring it to room temperature.
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3
Peel the cucumber, cut into 1-inch long sections and then cut into julienne strips. (De-seed the cucumbers if you prefer.) Toss with 1 teaspoon salt and let sit in a colander for 20 minutes.
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4
Toast the cumin seeds in a small pan over medium heat until they change change color, 2-3 mins.
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5
Mix the cumin, garlic, lemon juice, dill, coriander powder and cayenne pepper into the yogurt.
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6
Pat the cucumbers dry with a paper towel and toss with the yogurt mixture. Season with salt and pepper and stir in the chopped mint.
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7
Prepare the grill (medium heat). Brush the fish with olive oil and season well with salt and pepper. Grill fish, turning once, until the fish is just cooked through, 6-8 minutes in total.
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8
Scatter the baby arugula leaves on the plate/s. Spoon the cucumbers over the leaves and arrange the fish on the top. Season with a generous amount of lemon juice and a drizzle of good olive oil. Serve immediately.
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9
Do-ahead: You can prepare the yogurt mixture minus the cucumbers and mint ahead of time. Add the cucumbers and mint and season with salt and pepper just before serving.