Below are the amounts for a single serving (or for 1-2 lbs. cooked veggies) and if you want some to keep in the refrigerator for multiple uses (those amounts in parentheses).
I’ll have to test out some variations, but I would guess this would be really good with some lemon in it, garlic (maybe even whole cloves for flavor), or even a little honey. Seems like it would be a really good mayo alternative for some potato salad and would probably be really good with some fresh herbs.
2 T. (1/2 c.) olive oil
1T (1/4 c.) white wine vinegar
1 tsp. (4 tsp.) Dijon mustard
dash or two each (1/2 tsp. each) salt and pepper