Ingredients

• 4 spring onions or 6 scallions, whites only, thinly sliced
• 1/4 cup apple cider vinegar
• 2 teaspoons sugar
• 1 teaspoon kosher salt
• 12 slices thick-cut bacon
• 2 tablespoons pure maple syrup
• 1/4 cup mayonnaise
• 1 tablespoon Sriracha
• 8 slices white sandwich bread, such as Pullman
• 1/4 cup mayonnaise
• 2 tablespoons unsalted butter
• 4 large eggs
• Kosher salt, ground pepper
• 1 cup arugula leaves

Instructions

1. Combine onions, vinegar, sugar, salt, and 1 tablespoon water in a small bowl and toss to combine; let stand for 30 minutes.
2. For maple bacon and spicy mayo: Preheat oven to 350°F. Place bacon on a foil-lined large rimmed baking sheet; brush both sides with syrup. Bake until bacon begins to crisp but is still pliable, 20-25 minutes. Mix mayonnaise and Sriracha in a small bowl to combine; set aside.
3. Preheat oven to 350°F. Place bacon on a foil-lined large rimmed baking sheet; brush both sides with syrup. Bake until bacon begins to crisp but is still pliable, 20-25 minutes.
4. Mix mayonnaise and Sriracha in a small bowl to combine; set aside.
5. For fried eggs and assembly: Spread 1 side of bread slices with plain mayonnaise. Heat a large skillet over medium-low heat. Working in batches, cook bread, mayonnaise side down, until brown and crisp, about 3 minutes. Wipe out skillet. Melt butter in same skillet over medium heat; crack eggs into skillet. Cook, occasionally basting with butter in skillet, until whites are set, about 3 minutes. Season with salt and pepper. Spread untoasted side of each bread slice with spicy mayo. Build sandwiches with bread, bacon, eggs, pickled spring onions, and arugula.
6. Spread 1 side of bread slices with plain mayonnaise. Heat a large skillet over medium-low heat. Working in batches, cook bread, mayonnaise side down, until brown and crisp, about 3 minutes. Wipe out skillet.
7. Melt butter in same skillet over medium heat; crack eggs into skillet. Cook, occasionally basting with butter in skillet, until whites are set, about 3 minutes. Season with salt and pepper.
8. Spread untoasted side of each bread slice with spicy mayo. Build sandwiches with bread, bacon, eggs, pickled spring onions, and arugula.