Curried Grilled Shrimp and Okra

Name: Curried Grilled Shrimp and Okra
Ingredients: 3 tablespoons ghee, melted; 1 teaspoon coriander seeds, gently crushed; 1/2 teaspoon cumin seeds, gently crushed; 4 to 5 cardamom pods, gently crushed; 1 cup basmati rice; Kosher salt and freshly ground pepper; 1 1/2 cups low-sodium vegetable broth; 1 1/2 pounds jumbo shrimp, peeled and deveined; 1 tablespoon curry powder; 12 ounces fresh okra, tops trimmed, halved lengthwise if large; 1 red onion, cut into 1/2-inch wedges, root end attached; Plain yogurt, for serving