Tunisian Couscous with fish from Sfax

Ingredients:(for 6 persons): 1 kg of Couscous ;6 pieces of grouper;2 garlics;1 big onion;12 hot green peppers;1 spoon of harissa;2 spoons and a half of tomato puree ,1 glass of olive oil ;1 little glass of cumin ;salt and pepper.
Preparation: Wash well the fish, add a little salt, cumin and sweet pepper. Put the onion on soft fire with oil during 5 minutes. Add the green peppers, let them a moment, then add the harissa, tomatos, cumin and garlic, cook them during 10 mn while mixing. Remove the green peppers in an another pan then pour 1 liter and a half of water on the mixture. When the water starts to boil, add the fish and leave on a soft fire during 15 to 20 minutes. Whille weting the couscous with oil, water and salt. Cook the couscous with the vapor during 20 minutes, it will be enough for you to place it in a large container. Withdraw fisf of the bubble, at the same time add the sauce to the couscous. Dicorate your couscous with green peppers and the grouper