Heat the oil in a medium saucepan over medium-high heat. Add the shallots and cook until softened, about 2 minutes. Stir in the garlic and curry powder and cook until fragrant, abovut 15 seconds. Stir in the broth and raisins. Bring to a boil.
Stir in the couscous and remove the pot from the heat. Cover and let stand for 5 minutes. Fold the mint and lime juice into the couscous. Season with salt and pepper to taste.