Cut a 16 oz block of sharp cheddar cheese into rectangles that will fit into the KitchenAid Shredder Attachment. There should be about 4 rectangles of cheese. Use the fine shredding blade. Shred your cheese into the mixing bowl you will be using until all the cheese is shredded.
Set mixing bowl onto stand mixer.
Add Duke's Mayonnaise to mixing bowl.
Remove the pith membrane and seeds from the Serrano peppers then mince them and add to your mixing bowl.
Cut about 2 slices of onion and finely chop or mince them. You should have about 4 oz from this. Add this into mixing bowl.
Add garlic powder and ground cayenne pepper to mixing bowl.
Drain you diced pimento jar, leaving just a little juice left and add that to the mixing bowl.
Add flex edge beater to stand mixer, set onto low and mix all ingredients for about 1 minute.
Use a silicone spatula to transfer the mixture into a bowl or airtight container
Yields about 4 cups of pimento cheese spread.
Take the bread of your choice (I am using a Keto Bread today, but this pairs well with so many kinds of bread, including Sourdough, Wheat, White, Brioche and Croissants). Lightly toast the bread of your choice.
Spread about 2-4 tbsp of pimento cheese onto each toasted slice of bread. (4-8 tbsp total). Spreading it in 2 layers of cheese is helpful.
Add a large romaine leaf onto the top of the pimento cheese spread on one slice of bread. Put the 2 slices of bread together with the romaine tucked in the middle.
Thoroughly spray the exposed side of toast with olive oil spray. Flip the sandwich over and repeat.
Cut the sandwich in half on a diagonal and prop up so you can see the inside of the sandwich for the best presentation.
Now enjoy this delicious pimento cheese sandwich!