Gorgonzola Lamb Burgers with Pickled Cherry Relish

INGREDIENTS

• For Relish:
• 1/2 cup
• (about 20), pitted
• 1/2 cup (4 ounces) cherry tomatoes
• 3 tablespoons fresh parsley leaves
• 2 tablespoons shelled pistachios (roasted and unsalted if you can find them)
• salt and freshly ground black pepper, to taste
• For Burgers:
• 3/4 pound ground lamb
• 1/4 cup (2 ounces) crumbled gorgonzola cheese
• 1 shallot, chopped
• 2 garlic cloves, minced
• 1 tablespoon balsamic vinegar
• 2 teaspoons fresh chopped oregano or 1/2 teaspoon dried oregano
• 1/4 teaspoon ground cinnamon
• 1/4 teaspoon red pepper flakes
• 1/2 teaspoon kosher salt
• 1/2 teaspoon freshly ground black pepper
• olive oil, for cooking
• For Assembly:
• 4 large or 6 slider-size burger buns
• butter
• handful fresh arugula
• greek yogurt (optional)