Preheat the oven to 400°. In a large ovenproof skillet, heat the olive oil. Add the merguez and cook over moderately high heat, turning occasionally, until browned all over, about 5 minutes.

Add harissa according to your taste and the strength of the brand you are using. Add reserved merguez sausage. Season with salt as needed. Add 1½ cups water and pasta to the same pot. Bring to a ...