Thai Corn Chowder

Name: Thai Corn Chowder
Ingredients: 1 tablespoon coconut oil; 1/2 yellow onion, diced; 2 teaspoons salt; 2 cloves garlic, minced; 1 or 2 Thai chilies, minced (can substitute any other chili, depending on how spicy you like it); 1 tablespoon freshly grated ginger; zest from one lime; 2 medium potatoes, diced (I used Russet, but Yukon Gold or similar would also work well); 3 ears of corn, kernels cut from the cob (or 2-3 c. frozen corn); 3 corn cobs, broken in half (if available); 1 stalk of lemongrass, cut into 2 inch long pieces; 1 kaffir lime leaf, torn into large pieces; 3 cups vegetable broth; 3/4 cup coconut milk; 1 cup cherry tomatoes, cut into quarters; bunch of Thai basil, thinly sliced; bunch of cilantro, roughly chopped; juice from 1/2 a lime