1Bring a large pot of salted water to a boil. Add the spaghetti and cook according to package instructions until al dente. Drain and set aside.
While the pasta cooks, dice the eggplant, zucchini, and red bell peppers into bite-sized pieces. Chop the onion and mince the garlic.
Heat the olive oil in a large skillet or sauté pan over medium heat. Add the onion and cook for 2-3 minutes until softened.
Add the garlic and cook for another 1 minute until fragrant.
Add the diced eggplant, zucchini, and red bell peppers to the pan. Sprinkle with salt, ground coriander, and ground cumin. Stir well to coat the vegetables with the spices.
Cook the vegetables for 10-12 minutes, stirring occasionally, until they are tender and lightly browned.
Stir in the harissa paste and cook for another 2 minutes, allowing the flavors to meld.
Add the cooked spaghetti to the pan with the vegetables. Toss everything together until the pasta is well coated with the sauce and vegetables are evenly distributed.
Remove from heat and sprinkle with chopped fresh mint.
Serve immediately, garnished with extra mint if desired.