Soup Season: Blue Hubbard Squash Soup

Blue Hubbard Squash 1 medium Blue Hubbard or kabocha squash4 tablespoons olive oil, divided1 tablespoon kosher salt, divided¾ teaspoon black pepper, divided, plus more for serving1 medium-size yellow onion, chopped2 garlic cloves, chopped2 teaspoons ground coriander 1...