Bacon and Egg Sandwiches with Pickled Spring Onions recipes

Name: Bacon and Egg Sandwiches with Pickled Spring Onions recipes
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; 2 tablespoons unsalted butter; 4 large eggs; kosher salt; ground pepper; 1 cup arugula leaves