Start by hand grating the sharp cheddar & the Extra sharp cheddar cheese. The grating of the cheese is so important for the texture. Use a box grater and grate on the side with the large grooves.
In another bowl, mix the room temperature cream cheese, black pepper, mayonnaise & sea salt.
Then mix the grated cheese with the other ingredients. Combine, being careful to preserve the grate cheese texture.
Once combined add in the pimentos last. The reason to wait until the last step to add the pimentos is to protect their shape and texture.
Cover bowl with plastic wrap.
Refrigerator 12 to 36 hours for flavor development.