Sandwich Spread
["4 c. pimentos", "2 c. onions", "2 c. vinegar", "4 c. sugar", "4 Tbsp. butter", "2 Tbsp. salt", "4 Tbsp. flour", "4 tsp. celery seed", "2 Tbsp. mustard"]
["Mix thoroughly and boil 5 minutes, stirring constantly."]
["pimentos", "onions", "vinegar", "sugar", "butter", "salt", "flour", "celery", "mustard"]