Step 1

Grate the cucumber coarsely on a box grater. In a medium bowl, stir the cucumber into the yogurt, along with the garlic and the lemon. Season with salt, starting with 1/4 teaspoon kosher salt, adding more by the 1/4 teaspoon to taste. Add more lemon to taste as well — this sauce should taste nicely seasoned. Spread this yogurt sauce onto a large platter.

Step 2

In a small bowl, stir together the sumac, coriander, cumin, and dried chile flakes.

Step 3

Slice the tomatoes and arrange over the yogurt sauce in an even layer. Season all over with the spice rub. Season generously with sea salt (kosher salt is fine, too). Season with freshly cracked black pepper to taste.

Step 4

In a large bowl, toss the cherry tomatoes, onion, and chickpeas with a good pinch of flaky sea salt, pepper to taste, and the olive oil and vinegar. Taste. Adjust seasoning as necessary. Add the arugula and toss gently. Spread this salad atop the tomatoes. Serve, being sure to include each of the elements — the yogurt sauce, the tomatoes, the chickpea salad — with each serving.