Heat a large skillet over medium heat and cook bacon for 4-6 minutes per side, until crisp. Transfer to a paper towel-lined plate. Alternatively, bake at 400F for 15 minutes or microwave about 1 minute per slice.
As the bacon cooks, toast the sourdough slices in a toaster or skillet until golden brown and crisp. Spread mayo evenly over one or both slices of the toasted bread. Season the tomatoes lightly with salt and black pepper.
To assemble, layer avocado, tomato, lettuce, and bacon slices on the sourdough. Place the second slice of bread on top, slice in half if desired, and serve immediately.
Notes
Homemade Mayo without Eggs
¼ cup aquafaba (liquid from canned chickpeas)
1 tablespoon maple syrup
2 teaspoons lemon juice or apple cider vinegar
1 teaspoon salt
¼ teaspoon dijon mustard
1 cup vegetable oil or other neutral oil
To make homemade mayonnaise without egg, add all of the ingredients but the oil to a tall cup. Using an immersion blender, give the mixture a few quick pulses to combine everything. While blending, slowly pour the oil in, about a ¼ cup at a time. The emulsification process takes time, so be patient, it will come together. This recipe makes about 1 cup, store in an airtight container in the fridge for up to 2 weeks.