Summer Corn and Seafood Chowder

Name: Summer Corn and Seafood Chowder
Ingredients: 2 tablespoons extra-virgin olive oil; 1 medium leek, light green and white parts only, halved lengthwise and thinly sliced; 2 ears fresh corn, kernels cut off, cobs scraped and cobs reserved (about 1½ cups kernels and scrapings); 3 garlic cloves, minced; 8 ounces Yukon Gold or yellow potatoes, peeled and cut into ½-inch cubes; 1 (8-ounce) bottle clam juice; Salt and pepper; 1 pound skinless cod fillets, cut into 1- to 1½-inch pieces; 1/2 pound medium shrimp, peeled and deveined; 1 cup unsweetened coconut milk; 2 cups/2 ounces baby spinach; 1 tablespoon lemon juice; 1 tablespoon chopped chives, plus more for garnish; 2 teaspoons grated fresh ginger; Crusty bread, for serving