Spicy Mango Hot Dogs with Crunchy Fried Onions

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1 1/2 cups finely diced mango

2 tablespoons finely diced red onion 

2 teaspoons rice vinegar 

2 scallions, white and light green parts only, thinly sliced 

1/2 English cucumber, peeled, seeded and finely diced 

1/2 jalapeno, minced 

Kosher salt and freshly ground black pepper 

8 hot dogs, butterflied

8 brioche hot dog buns

Unsalted butter, at room temperature, for brushing the buns

1/2 cup mayonnaise 

1 cup crunchy fried onions