What Should Be Eaten With Mustard

In this week’s parsha (Bo), there is an item that the shulchan aruch says  should be eaten with mustard

Shulchan Aruch (Y.D. 61 – 12) Matnos Kehuno (meats) should be roasted and eaten with mustard.

( should be eaten in a royal manner , like kings eat their food.)

One of the 24  Matnos Kehuno is, the sheep that is used to redeem a first born

donkey, and given to the Kohen. (pidyon peter chamor).