Step 1

Mix paprika, coriander, cumin, cinnamon, and cayenne in a small bowl. Heat oil in a large skillet over medium. Add paprika mixture and garlic and cook, stirring constantly, until fragrant, about 30 seconds. Add tomato paste and cook, stirring constantly, until darkened, about 1 minute. Stir in spinach, 1½ cups water, sugar, salt, and several grinds of pepper; cover and bring to a simmer over medium-high. Cook, stirring occasionally and breaking up spinach with a spoon, until spinach is dispersed, 3 to 4 minutes.

Step 2

Nestle fish in sauce and return to a simmer. Reduce heat to medium and cook, covered, until fish is cooked through and flakes easily with a fork, 5 to 10 minutes depending on thickness.Top with lemon zest and cilantro and serve with couscous.