Cod with Kale and Chorizo in Broth

Ingredients

• 1 bunch kale (about ¾ pound)
• 1 small onion
• 3 cloves garlic
• 1 ½ ounces cooked chorizo sausage
• 1 tablespoon olive oil
• 1 ½ cups fish stock, preferably lower sodium
• Four 6-ounce skinless cod fillets
• 1/8 teaspoon salt
• 1/8 teaspoon freshly ground black pepper