In a small saucepan over medium heat, combine water, ground mustard, and cornstarch. Stir in corn syrup and cider vinegar; cook and stir until thickened and bubbly.
Cook and stir another 2 minutes. Remove from heat and serve.
Makes approximately 1/2 cup Savory Mustard Sauce.
Savory Mustard Sauce Recipe: https://whatscookingamerica.net/sauces_condiments/savorymustardsauce.htm