please could someone help me with this pasta salad dressing recipe?

[mckenzie]

Years ago when i lives at home I used to make a tuna pasta salad with mushrooms, kidney beans and spring onions and a dressing that included olive oil, dijon mustard and other things., It was really tasty and I want to make it for a family party tomorrow but cannot find the recipe anywhere. Can anyone think please what the other ingredients and measurements might be? And is it safe to cut the mushrooms tonight and put them in or will they look a bit sorry for themselves by tomorrow afternoon?

TIA

Equal quantities of oil and vinegar, good heaped teaspoon of mustard, salt and pepper, perhaps a pinch of sugar.

Experiment, and taste until it seems right.

thank you tb. I didn't see your message in time for yesterday but I shall try that later in the week.