Combine the ground lamb with the harissa, the paprika and the salt in the bowl of a stand mixer with the paddle attachment, and blend on low speed until tacky, about 2 minutes, drizzling in the red wine vinegar as it blends. You can also wear gloves and mash the meat around with your hands if you don't have a mixer.
Cook a small piece of the sausage and taste to see if you like the heat/spiciness, adjust as needed, traditionally merguez is very spicy. I like to chill the sausage overnight before cooking, but it can be cooked straight away in a pinch.
From here, the sausages can be formed into hand rolled sausages and cooked, or put into sheep casings, which is more traditional. When cooking the sausages, brown them well on high heat quickly, but don’t overcook as they're best eaten pink or medium rare.
Serve the merguez with rice, cooked greens, as part of a mixed grill, or a lunch as pictured here with fresh butter lettuce, winter radishes, greek yogurt with a sprinkle of sumac and quinoa with crunchy walnuts.