Ham Sauce (Mustard Sauce) - cooking recipe

Ingredients

1/2 cup white sugar
1/2 cup apple cider vinegar
1/2 (10.75 ounce) can condensed tomato soup
1 tablespoon dry mustard powder
3 egg yolks
1/3 cup butter, melted
1 tablespoon all-purpose flour
1 pinch salt

Preparation

Bring about 3 inches of water to a simmer in the bottom of a double boiler. Whisk together the sugar, vinegar, tomato soup, mustard powder, egg yolks, and melted butter in the top of the double boiler. Transfer 1/4 cup of the mixture to a small bowl; mix in flour until smooth. Whisk flour mixture back into mustard sauce; combine thoroughly. Cover and turn heat to medium-high.
Cook sauce until thick, approximately 30 minutes; stir occasionally. Turn heat to low and simmer sauce to hold.