Zippy Sandwich Mustard - cooking recipe

Ingredients

1/4 c. sugar
1/4 c. dry mustard
2 Tbsp. flour
dash of salt
3 Tbsp. boiling water
1/3 c. vinegar
2 (6 oz.) jars French's mustard

Preparation

Combine first 4 ingredients.
Mix well.
Add boiling water; stir to form paste.
Stir in vinegar and mustard.
Mix well. Store in mustard jars in refrigerator.