Crab and Cream Cheese Pizza

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1 pound jumbo lump crabmeat

8 ounces cream cheese, at room temperature 

1/2 cup drained and chopped water chestnuts 

1/4 cup mayonnaise 

1 tablespoon low-sodium soy sauce 

2 teaspoons Chinese hot mustard, plus more for serving  

1 teaspoon toasted sesame oil 

2 scallions, sliced, plus more for garnish 

1 clove garlic, finely chopped  

Kosher salt and freshly ground white or black pepper 

All-purpose flour, for dusting 

1 pound store-bought pizza dough, at room temperature 

1 large egg  

2 teaspoons white sesame seeds or black sesame seeds (or a combination) 

Duck sauce, for drizzling 

Chow mein noodles, for garnish