The First Thing You Should Do with a New Bag of Dried Beans

1¼

lb. ground lamb

1

lemon

2

garlic cloves

1

tsp. ground coriander

1½

tsp. Diamond Crystal or 1 tsp. Morton kosher salt, divided

1

tsp. freshly ground black pepper, divided

¼

cup (packed) cilantro leaves with tender stems

½

cup plain whole-milk Greek yogurt

4

Tbsp. extra-virgin olive oil, divided

4

Tbsp. unsalted butter, room temperature

4

hamburger buns, preferably whole wheat

4

cups baby arugula

Source : food