Pickled Vegetable Slaw: 3/4 cup rice vinegar 2 tbsp water 2 tsp white sugar 2 tsp sesame seeds 1 small carrot 1/4 large English cucumber 1/4 small red onion, cut into 1/8-inch thick wedges Bang Bang Sauce: 1/2 cup mayonnaise 1/4 cup Thai sweet chili sauce 2 tsp Sriracha, or more to taste 1 tsp rice vinegar 1/8 tsp salt Burgers: 1 (8 oz) pkg mushrooms, halved 6 tbsp peanut oil, divided 1 pound grou…