Lemon Chicken With Pine Nut Sauce

• 1 lemon quartered
• 1 clove garlic (finely chopped)
• 950 ml chicken broth
• 325 gr box couscous
• 95 gr carrot (diced)
• 65 gr sweet pepper (red finely chopped)
• 65 gr zucchini (diced)
• 60 gr onion (red finely chopped)
• 60 ml olive oil
• 36 gr pine nuts (toasted)