Mediterranean Lamb Burger

Ingredients

• ¼ peeled and thinly sliced red onion
• ½ cup red wine vinegar
• 2 tablespoons sugar
• 1 tablespoon sea salt
• ½ peeled, seeded, and shredded cucumber
• 1 cup full-fat Greek yogurt
• ¼ cup extra virgin olive oil
• 1 finely minced garlic clove
• juice of ½ lemon
• 1 ½ teaspoons finely minced fresh dill
• salt
• pepper
• 2 pounds ground lamb
• 1 ½ teaspoons ground cumin
• ½ teaspoon ground coriander
• 1 teaspoon dry oregano
• ½ teaspoon sumac
• 2 teaspoons sea salt
• 1 teaspoon black pepper
• ¼ peeled and finely grated red onion
• 2 finely grated garlic cloves
• 4 toasted Kaiser buns
• 1 cup arugula
• 16 dill pickle slices
• ½ cup crumbled feta cheese
• 2 tablespoons chopped fresh mint