Crab Cake Sandwiches

Name: Crab Cake Sandwiches
Ingredients: 8 oz. store-bought slaw mix; ¼ cup apple cider vinegar; 1 tsp. sugar; 4 Tbsp. extra-virgin olive oil, divided; 1½ tsp. Diamond Crystal or ¾ tsp. Morton kosher salt, divided, plus more; 1 large egg; 8 oz. lump crabmeat, picked over; ½ cup panko (Japanese breadcrumbs); 2 Tbsp. finely chopped tender herbs (such as parsley, chives, and/or dill); 1 garlic clove, finely grated; 1 Tbsp. plus 1 cup mayonnaise; Freshly ground black pepper; 3 Tbsp. finely chopped dill pickles; 1 Tbsp. plus 1 tsp. Old Bay seasoning; ⅓ cup all-purpose flour; 4 brioche buns, split