Mustard
Mustard is a condiment or sauce used for seasoning, body, and balance. Add it gradually, taste as you go, and adjust near the end of cooking.
Identity
Condiment or sauce
Add gradually and taste for balance.
Condiments and sauces can change sweetness, acidity, salt, and body quickly. Add in stages, taste, and adjust near the end so the flavor stays balanced.
Wikimedia Commons
Reference image
Mustard reference image.
Source: Wikimedia Commons
Substitutions
Acceptable
Condiments As Desired -> Mustard
Condiments as desired, such as chipotle mayonnaise, ketchup, mustard, or mayonnaise
The source lists this as an alternative in the same ingredient row.