This dish turns the proportion of fish to vegetables on its head -- more vegetables, less fish. There's enough shrimp and squid to let you know you're eating a fish stew, but enough chickpeas and spinach to let you know it is something different. A puttanesca-like seasoning of garlic, olives, capers, anchovies and tomato paste flavors the braise.
Add the remaining 2 tablespoons oil to the skillet; increase heat to medium-high. When oil is hot, add garlic, olives, capers and anchovies. Cook, stirring occasionally, until fragrant, a minute or two. Add tomato paste and cook, stirring occasionally, until it darkens slightly, 2 to 3 minutes.
03Start adding spinach a handful at a time; keep stirring until all the spinach fits in the pan and starts to release its water; sprinkle with a little more pepper, then add the stock, chickpeas and red chile flakes if you’re using them. Adjust the heat so the mixture bubbles gently but steadily, then stir in the squid and the shrimp. Cook until the seafood is just cooked through, 2 to 3 minutes.
04Taste and adjust the seasoning. Divide among bowls, sprinkle with bread crumbs and serve.