Spiced Lamb Sausages

Name: Spiced Lamb Sausages
Ingredients: 1 lb. trimmed lamb shoulder, cut into 1″ cubes, or 1 lb. ground lamb; 3 cloves garlic, finely chopped; 1 tbsp. harissa; 1 tbsp. minced flat-leaf parsley; 1 tsp. paprika; 1⁄2 tsp. ground coriander; 1⁄2 tsp. ground cumin; 1⁄4 tsp. ground fennel seed; Kosher salt and freshly ground black pepper, to taste; 4 tbsp. extra-virgin olive oil; 1⁄2 cup yogurt; 8 leaves basil, roughly chopped; Chopped tomatoes, red onions, and cucumbers, for serving; Flat bread, for serving