Iceberg and Cabbage Slaw

Name: Iceberg and Cabbage Slaw
Ingredients: ¼ cup buttermilk; 2 tablespoons fresh lemon juice; 1 tablespoon mayonnaise; 3 tablespoons olive oil; Kosher salt and freshly ground black pepper; 1 head of iceberg lettuce, outer leaves removed, thinly sliced; ½ small head green cabbage, outer leaves removed, thinly sliced; 4 scallions, thinly sliced; 3 tablespoons chopped fresh chives; 1 teaspoon celery seeds