Put the mayonnaise, salad cream and mustard into a medium mixing bowl, along with 2 teaspoons of vinegar from the jar of gherkins or pickles and mix well.
Prepare the vegetable by peeling, cutting into thin batons and then dicing finely. They need to be small, but not so fine they don’t have any texture.
Add the diced vegetables to the mayonnaise mixture, season with pepper and salt and mix well.
Store in a jar in the fridge and use within 3 days.
