Rinse each snapper in cool water with a drop or two of lemon to rid the fish from any debris left after cleaning.
Cut two diagonal slits on either side of each fish. Cut quite deep until you reach the bone.
Tear off two large sheets of foil large enough to envelope each snapper and place on top of baking sheet.
Place each snapper in the middle of each foil sheet.
Drizzle lemon juice over each fish.
Mix together salt and spices and sprinkle inside and over the top of each fish.
Push as much of the garlic as you can into the slits you cut and then place the rest in the inside cavity of each fish.
Place a couple of lemon slices inside the cavity of each fish and the rest on top.
Drizzle each fish with a modest amount of olive oil.
Shuffle each fish around in the foil a little to mix the ingredients that have fallen off to the sides.
Loosely fold foil around fish to create a sealed pouch.
Place in preheated oven at 350 and cook for 30 mins.
Remove fish from oven and open up pouches and make sure the fish is beginning to cook as expected. Be careful not to spill the juices that have collected at the bottom of each pouch.
Raise oven temperature to 425, reseal pouches and return to oven.
Cook for a further 10 mins then remove from oven.
Each fish should be flaky and opaque. Taste the sauce to ensure the flavors are nicely combined.
If your fish needs more cooking return to the oven for a further 5-10 mins.
Once cooked remove lemon slices from cavity and serve as desired.