I got this recipe from Southern Living
Basic Pimiento Cheese Recipe
Ingredients
1 1/2 cups mayonnaise
1 (4-oz.) jar diced pimiento, drained
1 tsp. Worcestershire sauce
1 tsp. finely grated onion
1/4 tsp. ground red pepper
1 (8-oz.) block extra-sharp Cheddar cheese, finely shredded
1 (8-oz.) block sharp Cheddar cheese, shredded
Stir together first 5 ingredients in a large bowl; stir in cheese. Store in refrigerator up to 1 week.