Heat oven to 220°C/435°F. Mix garlic, ras-el-hanout and olive oil in a small bowl. Line a baking sheet with foil and rub the fish fillets with the spiced oil and place on the baking sheet. Season with salt. Place skin side up and bake for 8-10 minutes until fish is tender. Sprinkle the lemon zest over the fillets when you remove them from the oven.
Squeeze the juice of the lemon into a bowl and add the cucumber, shallot and coriander. Season with salt and combine.
Serve the fish with the cucumber on the side.
Nutrition information is an estimate and will vary depending on the ingredients used.