16 cleaned calamari (tubes and tentacles) |
6 tablespoons olive oil, divided |
1 onion, finely chopped (about 1 cup) |
2 tablespoons minced garlic, divided |
1 cup fine, dry breadcrumbs |
1/4 cup chopped fresh parsley |
1/2 teaspoon salt |
1/2 teaspoon freshly ground black pepper |
1 (8-ounce) bottle clam juice |
1/2 cup dry white wine |
2 medium tomatoes, seeded and chopped |
2 cups baby spinach leaves |
1/4 cup fresh lemon juice |
1/4 cup chopped fresh basil |
1 teaspoon crushed red pepper |
2 tablespoons butter, cut into pieces |
1/4 cup freshly grated parmesan cheese |