Shrimp are easiest to shell and devein when they are raw. Do this under cold running water. Bring a quart of water to a boil in a saucepan. Add the cleaned shrimp and cook them a scant 3 minutes. Drain at once and put them in the bowl you intend to serve them in. Add the lemon and onion slices and the black olives. Toss together. in another bowl combine lemon juice, oil, vinegar, spices, herbs and mix together well. Stir this marinade into the shrimp mixture. Cover the dish and let it sit in the refrigerator at least 2 hours, giving it a stir once or twice.
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