Ingredients: 4 cups child arugula leaves,1/ 4 teaspoon newly ground black pepper,1/ 4 teaspoon crushed red pepper,1 1/2 cups (1/4-inch-thick) diagonally sliced seeded peeled cucumber,1/ 3 cup dry breadcrumbs,1 big egg, lightly beaten,2 ounces reduced-fat feta, fallen apart,4 teaspoons chopped fresh mint,4 teaspoons sliced fresh thyme,3 garlic cloves, minced,1/ 2 cup plain fat-free Greek yogurt,1/ 4 teaspoon ground allspice,10 ounce ground sirloin,5 ounces lean ground lamb,2 tablespoons fresh lemon juice, divided,1 tablespoon extra-virgin olive oil,1/ 3 cup grated red onion,3/ 8 teaspoon salt, divided
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