Assemble sandwich: spread 2 tablespoons basic cheddar sauce on 1 slice of sourdough.
Spread 2 teaspoons pepper relish on the other slice of sourdough.
Top the basic cheddar slice with 2 pieces cooked bacon, covering the whole surface of the bread. Place granny smith slices on top of bacon.
Take the slice with pepper relish and place relish-side down on the bacon slice, forming a sandwich.
Heat the oil in a nonstick skillet over low heat. Spread 1 teaspoon basic cheddar sauce on one outward facing slice of sourdough.
Place the sandwich cheese-sauce side down in the skillet and cook over low heat, 3-4 minutes. While sandwich is cooking, spread 1 teaspoon basic cheddar sauce on the bread side that is facing upwards. Turn up heat to medium low and cook for another 30 seconds.
Flip sandwich and cook for another 3-4 minutes.
Transfer sandwich to a cutting board to cool, then slice in half diagonally.
