Savory Lamb Sliders

Name: Savory Lamb Sliders
Ingredients: 1 1/2 pounds ground lamb; 1/4 cup minced shallot; 2 tablespoons finely chopped fresh mint; 2 tablespoons finely chopped fresh parsley; 1 tablespoon kosher salt; 1 teaspoon freshly ground black pepper; 1 teaspoon ground cumin; 1/4 teaspoon paprika; 1 clove garlic, grated; 1 cup plain Greek yogurt, strained; 1/2 cup grated cucumber; 1 tablespoon finely chopped fresh dill; 1 tablespoon finely chopped fresh mint; 2 teaspoons lemon juice; Kosher salt and freshly ground black pepper; One 9-count package pretzel slider buns, preferably King’s Hawaiian, warmed or lightly toasted; Green leaf lettuce, for garnish; 1/4 cup crumbled feta; Pickled Onions, recipe follows; 1 cup red wine vinegar; 1/4 cup sugar; 2 tablespoons kosher salt; 1 tablespoon pickling spice; 1 red onion, sliced thinly into rings