How to substitute for mustard seed<br>Use prepared horseradish to add spice. Prepared horseradish is made by combining ground horseradish with vinegar, and sometimes other spices, to form a sauce. You can get it from your local supermarket.
Prepared horseradish always has the same spices. 
It said that you sometimes add other spices. So the spices can be different and you may not always use the same one. Because of that the statement is incorrect.
( z1 have :ARG0 ( z2 horseradish :ARG1-of ( z3 prepare ) ) :ARG1 ( z4 spice :ARG1-of ( z5 same ) ) :time ( z6 always ) )