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| distilled vinegar: 1/2 cup |
| eggs: 3 |
| vegetable oil: 2 tsp |
| granulated sugar: 2/3 cup |
| mustard powder: 1 Tbl |
| salted butter: 1 Tbl (melted) |
| all-purpose flour (unsifted): 3 Tbl |
| salt: 1 tsp |
| black pepper: 1/2 tsp |
| 2% milk: 1 cup |
| water: 3 cups |
Credit: AllRecipes
"This creamy sauce is served on our Lancaster, Ontario perch rolls - a popular item in these parts."