1/2 cup white vinegar
1/2 cup white sugar
2 tbsp flour
1/2 cup sweet cream (single cream)
2 tbsp dry mustard
turmeric, to color (optional)
Mix all ingredients with a wire whisk in the top of a double boiler.
Bring to a boil on stovetop over medium heat.Then continue to lightly boil until thick.
After this has thickened remove from heat and sprinkle a little turmeric in and blend to add more of a yellow color.