Jamaican Shrimp Chowder

1/4 cup yams or 1/4 cup sweet potato es

1/4 cup diced zucchini

1/2 cup diced onion s

1/2 cup diced carrot s

1/4 cup diced tomato es

1 cup peeled and cleaned shrimp

12 ounces unsweetened coconut milk

12 ounces clam broth or 12 ounces stock

1 teaspoon thyme

1/4 teaspoon pepper

1/2 cup scallion s or 1/2 cup green onions

2 teaspoons lime juice

1/4 cup chopped fresh basil