Tempura Mushroom Burgers

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Charred Scallion Mayo:

1/4 cup Donkey Sauce, recipe follows

2 tablespoons chopped charred scallions

Fried Oyster Mushrooms:

Canola oil, for deep frying

2 oyster mushrooms (4-ounce head each)

4 cups all-purpose flour, plus more for dredging

2 cups rice flour (or cornstarch)

4 large eggs

3 cups ice-cold seltzer water

Kosher salt

Tempura Mushroom Burgers:

2 ciabatta rolls, halved

2 tablespoons garlic butter

8 ounces finely shredded red and white cabbage

1/4 cup seasoned rice vinegar

2 tablespoons extra-virgin olive oil

2 tablespoons finely sliced red Fresno pepper

2 tablespoons chopped and charred scallions

1 tablespoon minced garlic

1 tablespoon yellow mustard

Kosher salt and freshly ground black pepper

1 lemon, halved

Donkey Sauce:

1/2 cup mayonnaise

2 tablespoons roasted garlic puree 

1/2 teaspoon yellow mustard 

1/4 teaspoon kosher salt 

1/8 teaspoon freshly ground black pepper 

1/8 teaspoon Worcestershire sauce