Deviled Eggs - cooking recipe

Ingredients

4 hard-cooked eggs
1/4 tsp. salt
1/2 tsp. dry mustard
1/8 tsp. pepper
1 tsp. vinegar
1 Tbsp. melted butter

Preparation

Cook eggs; remove shells and cut each in half lengthwise. Remove yolks.
Mix yolks with rest of ingredients.
Fill each half white of egg with mixture.