Stir together olive oil, herbs, lemon zest, sugar, salt and pepper.
Step2
Add prawns and toss until coated with marinade.
Step3
Let prawns marinate covered and chilled overnight or for at least 1 hour.
Step4
Stir in lemon juice, thyme and oregano and let stand at room temperature for 30 minutes.
Step5
Drain prawns in a fine sieve just before grilling.
Step6
Grill prawns on a rack set about 4 inches over glowing coals for 3 minutes on each side or until cooked through.
Tips & Warnings
Prawns may also be broiled on the rack of a broiler pan, under a preheated broiler about 4 inches from the heat for 4 minutes on each side.
To zest a lemon, use a fine grater or take off strips of peel with a zester or vegetable parer and finely chop. Be careful to remove only the yellow peel, not the bitter pith.