Grilled Lamb Skewers with Cucumber Salad

Name: Grilled Lamb Skewers with Cucumber Salad
Ingredients: 2 tablespoons cumin seeds; 2 tablespoons coriander seeds; 1 1/2 teaspoons red chile powder; 3/4 teaspoon Sichuan peppercorns; 1 1/2 teaspoons caraway seeds; 1 medium seedless cucumber, diced; 1 pint cherry tomatoes, halved; 1 small red onion, cut into 1/2-inch dice; 4 pickled garlic cloves, thinly sliced, plus 2 tablespoons pickling liquid; 1/4 cup distilled white vinegar; Kosher salt and freshly ground pepper; 2 pounds trimmed boneless leg of lamb, cut into 1-inch dice