The classic, British bacon butty sandwich consists of a sweet and tangy sauce and crispy bacon between two slices of toasted bread. This version is elevated with golden, caramelized onions.
Heat the canola oil in a skillet over medium heat. Add the onions and cook, stirring often, until they begin to soften (about 5 minutes).
2 tablespoons canola oil, 1 large yellow onion
Reduce heat to medium-low, add the balsamic vinegar and continue to cook, stirring occasionally, until deeply golden (around 20 minutes).
1 tablespoon balsamic vinegar
For the Bacon Butty
Place two paper towels on a plate. Arrange the slices of bacon on the paper towel, separately. Place 2 more pieces of paper towel on top of the bacon. (You may need to cook half of the bacon at a time, in order to fit the plate.)
8-10 slices smoked bacon strips
Microwave on high until the bacon is slightly crispy, about 3 to 5 minutes. It will crisp up more as it cools.
While the bacon is cooling, toast the bread slices.
4 slices white bread
Place the crispy bacon in between the bread slices with the caramelized onions. Add some brown sauce or BBQ sauce and serve.
Notes
If you want to cook your bacon in the oven instead, here’s how to do it: Preheat the oven to 400 degrees Fahrenheit, cover a baking pan with aluminum foil, put the bacon strips on top (do not overlap), and bake for about 10-20 minutes , or until crispy (keep an eye on them as time will vary depending on the thickness of the bacon).
If you need to store your sandwiches in the fridge for later, consume them within 3 days for best results. You can reheat them in an oven or toaster oven to retain the crispiness.
Slice the onions consistently for even cooking. Use an adjustable mandolin if you have. My preference is to cut them about ¼" thick. When cooked, onions shrink significantly, so it's best to avoid slicing them too thin.
Slice the sandwich diagonally for the perfect bite ratio and visual appeal. This also makes it easier to hold and bite into.