Fish Stew

Ingredients:

3 oz. mackerel
1 tsp. tomato paste
¼ c. tomato puree
1 c. chicken broth
¼ tsp. cayenne
1 c. baby spinach
1 tsp. garlic
¼ onion
1 tbsp. parsley
¼ c. lemon juice
1½ tbsp. butter