Spicy Red Lentil Coconut Soup with Shrimp Dumplings

Name: Spicy Red Lentil Coconut Soup with Shrimp Dumplings
Ingredients: 2 teaspoons fennel seeds; 2 teaspoons cumin seeds; 2 teaspoons coriander seeds; 1/4 cup peanut oil; 3 medium carrots, coarsely shredded; 2 medium red onions, halved lengthwise and thinly sliced crosswise; 1 medium leek, white and tender green parts only, thinly sliced; 4 garlic cloves, minced; 2 teaspoons minced fresh ginger; 1 small fresh red chile, seeded and minced; 5 cups water; 2 3/4 cups unsweetened coconut milk; 6 makrut lime leaves or six 1-inch strips of lime zest; 3/4 cup red lentils; Salt and freshly ground pepper; 2 small garlic cloves, smashed; 1/4 cup cilantro leaves; 1/4 cup mint leaves; 1 pound large shrimp, shelled and deveined; 1 tablespoon cornstarch; 1 tablespoon plus 2 teaspoons fish sauce, plus more for serving; 1/2 teaspoon sesame oil; 1/4 cup fresh lime juice; 1/2 cup finely chopped cilantro