Roasted Kabocha Squash Soup

Name: Roasted Kabocha Squash Soup
Ingredients: 1/2 large kabocha squash , seeded (about 3 to 4 pounds for the 1/2 squash); 2 1/2 tablespoons extra virgin olive oil , divided; Salt; 2 cups chopped or sliced onions; 2 ribs celery , sliced; 3 cloves garlic (about 1 tablespoon); 1 ( 2-inch) piece fresh ginger , peeled and grated; 1/2 teaspoon ground cumin; 1 teaspoon ground coriander; 4 cups chicken stock; 2 teaspoons kosher salt; 1/4 teaspoon black pepper; Lime juice , for serving; Chopped fresh cilantro , optional for serving