Popovers with Japanese-Style Crab Salad

Ingredients

• 1/2 lb fresh Dungeness crab meat
• 1/4 cup julienned cucumber
• 3 tablespoons mayonnaise, such as Kewpie or Sriracha mayonnaise
• 1/2 teaspoons sugar
• 1 cup all-purpose flour
• 2 large eggs
• 1 cup milk
• 1 teaspoon kosher salt
• 1 teaspoon sugar
• 5 tablespoons unsalted butter, melted