Since harissa is spicy, it pairs well with sweet vegetables like zucchini, sweet potato, and squash. But it's pretty versatile and its savory side works well with onion, fennel and bell peppers, too. Lemon zest or juice (or lime) add a brightness to the dish that helps cut through the spice. And harissa-seasoned meats are also delicious with the rich, creaminess of Greek yogurt (both regular or dairy free).