Dilute mustard powder with warm water until it reaches the consistency of thick sour cream.
Carefully pour boiling water over the above mixture. Leave for 8-10 hours (or overnight).
Drain all the water; then add salt, sugar, vinegar, oil, and mix well.
Notes
Step-by-Step Photos: My blog post includes helpful step-by-step photos to help guide you through making this recipe.
The extra step of adding boiling water to mustard paste is an optional step. This process will remove the extra bitterness from the mustard powder, and at the same time, activate the mustard oil.
Safety Tip: Never seal the jar or container tightly during the blooming process! As the mustard oil activates, a chemical reaction releases heat and gases, creating pressure buildup. To prevent cracking or explosions, always allow space for the gas to escape.
The provided nutritional information is an estimate per serving and is not guaranteed for accuracy.