Pour all ingredients into a bowl and stir with the whisk until the ingredients are mixed together. Then season with salt and pepper. Depending on which salad the dressing is used with, you need a different consistency. Maybe a little thinner for leafy salads and maybe a little thicker for mixed salads. For this you can easily dilute the dressing with water. The mustard in the recipe acts as an emulsifier so that the water and oil mix together. This keeps the dressing nice and creamy. The dressing also goes very well with slightly bitter salads such as rocket or endive etc.