Grilled Whole Mackerel with Lemon, Oregano, and Olives

Ingredients

• 3.3 lb mackerel whole spanish with head and tail) cleaned
• 1.3 oz kalamata olives pitted cut into slivers
• 6 slices optional: lemon (1/4-inch-thick)
• 1.5 tablespoons juice of lemon fresh
• 0.5 teaspoon lemon zest fresh finely grated
• 0.3 cup olive oil extra virgin extra-virgin
• 3 tablespoons oregano fresh finely chopped
• 2 tablespoons vegetable oil 

Equipment

• baking sheet
• oven
• knife
• whisk
• grill
• aluminum foil
• spatula
• tongs

Directions

1. Whisk together zest, lemon juice, and salt and pepper to taste, then add olive oil in a stream, whisking until combined well.
2. Whisk in olives and chopped oregano.
3. Make 1-inch-long slits at 2-inch intervals down middle of fish on both sides with a sharp paring knife, then brush fish all over with vegetable oil and season with salt and pepper. Season fish cavity with salt and pepper, then evenly distribute 3 lemon rounds and 3 oregano sprigs in cavity. Close cavity, then evenly arrange remaining 3 lemon rounds and 3 oregano sprigs on top of fish and tie fish closed with string at 2-inch intervals, securing lemon slices and oregano sprigs to fish.
4. Prepare grill for cooking. If using a charcoal grill, open vents on bottom of grill, then light charcoal. Charcoal fire is medium-hot when you can hold your hand 5 inches above rack for 3 to 4 seconds. If using a gas grill, preheat burners on high, covered, 10 minutes, then reduce heat to moderate.
5. Grill fish on lightly oiled grill rack, covered only if using gas grill, 15 minutes. Turn fish over using a metal spatula and tongs, then grill until just cooked through, about 15 minutes more.
6. Transfer fish to a large platter using 2 metal spatulas, then cut and discard string.
7. Serve fish with sauce.
8. • If you aren't able to grill outdoors, whole fish can be roasted on an oiled large baking sheet (17 by 14 inches) in middle of a preheated 425°F oven, without turning, until just cooked through, 30 to 35 minutes. If fish extends beyond baking sheet, fold up two 12-inch-long pieces of foil and put under head and tail to extend baking surface.• If fish tail begins to brown too much (on grill or in oven), loosely wrap with a small sheet of foil.