Easy Eggs Benedict Toast | Fussy Kitchen

Ingredients

• 3 large egg yolks plus 4 large eggs, cold, divided
• 1 tablespoon cold water, plus more, to taste
• 1 teaspoon cornstarch
• 1 teaspoon Dijon mustard
• 1 1/2 tablespoons fresh lemon juice, divided
• 1 teaspoon kosher salt, divided
• ice, to taste
• 2 tablespoons unsalted butter, cold, plus 12 tablespoons, melted, divided
• 1/8 teaspoon cayenne pepper
• warm water, to taste
• 4 (1/2-inch-thick) sourdough bread slices, toasted
• 8 thin slices prosciutto or speck
• 2 tablespoons fresh chives, roughly chopped, for garnish
• freshly ground black pepper, optional, to taste, for garnish