In a big mixing bowl take oil.Add milk and churn.

Now add mustard powder, pepper powder,sugar,and salt churn again.

Add vinegar and churn till thick. It takes about 7-8 minutes to thicken. every ingredients should be chilled.If not thicken keep it in refrigerator for 15 minutes than again churn.

Remove in a bowl add oregano and chilli flakes.Mix well.