Fried Fish Bites with Sweet Potato Fries and Spicy Mayo

Name: Fried Fish Bites with Sweet Potato Fries and Spicy Mayo
Ingredients: 1 1/4 cups mayonnaise; 2 tablespoons freshly squeezed lime juice (from 1 medium lime); 8 cilantro sprigs, stems trimmed; 2 medium garlic cloves; 1 teaspoon dry mustard powder; 1/2 teaspoon cayenne pepper; 1/2 teaspoon kosher salt; 4 cups vegetable oil; 2 large sweet potatoes (about 2 pounds); 2 teaspoons white wine vinegar; 1 pound sole or haddock fillets; 1/2 cup all-purpose flour; 1 teaspoon kosher salt; 1/2 teaspoon freshly ground black pepper; 1 cup chilled club soda