On hot days, a serving of oven-grilled mackerel makes for a light, nutritious meal. One that doesn’t demand long hours in the kitchen. What makes this dish for me, is the tangy and herbaceous chermoula, generally slathered over the fish. Teamed with a helping of garlic-fried spinach, this plate of oven-grilled mackerel leaves you feeling sated, not stuffed. How to make chermoula Chermoula is a North African marinade/condiment eaten mainly…