01 - Combine ground beef, minced garlic, ground cumin, cinnamon, smoked paprika, chopped parsley, salt, and black pepper in a mixing bowl. Mix gently until evenly combined, then shape into 20 to 24 small, uniform meatballs.
02 - Bring a large pot of salted water to a boil. Add linguine and cook until al dente, following package directions. Drain the pasta and reserve 1/2 cup of the cooking water.
03 - Heat olive oil in a large skillet over medium heat. Add the meatballs and sear, turning to brown all sides. Cover and continue cooking until the meatballs are cooked through, about 10 minutes. Remove from the pan and keep warm.
04 - Combine Greek yogurt, harissa paste, lemon juice, olive oil, and a pinch of salt in a small bowl. Whisk until smooth. If a thinner consistency is needed, incorporate a splash of the reserved pasta water.
05 - Toss hot pasta with the harissa cream sauce until evenly coated. Portion the pasta onto plates, add meatballs, and finish with chopped mint or parsley. Drizzle with extra harissa paste if desired.