Mustard Sauce for Corned Beef

This is how to make a simple mustard sauce for corned beef. This is how to take your meat to the next level with this corned beef mustard that is sweet but tangy, just like it should be with just 4 ingredients on top of your fresh or frozen corned beef brisket.

This pastrami mustard sauce for corned beef is amazing! With just a few ingredients you can add this to one of our baked corned beef recipes to bring it to the next level. Make a bit more spicy if you like or make sweet with more honey.

There are many ways to make corned beef and cabbage, we have tried them all! Our favorite method is probably our Instant Pot corned beef. It comes out perfectly tender every time. BUT with corned beef mustard sauce on top OH MY is it out of this world.

After following our How to Cook Corned Beef in the Oven you can bake it on top for the last hour too so it really sinks in. Meaning…..it is great no matter how you choose to cook your main protein. 😉

Let’s start with this marinated beef you can either buy in a point cut or flat cut, I highly recommend the latter if you have the choice. I don’t always in this case but the thicker the cut the more tender each bite will be. Don’t throw away that spice packet either, you want both things on the top to add tons of flavor.

You can even make Instant Pot frozen corned beef if you forgot to defrost it. Here are a few questions you might have before you get going on this. There are many uses, such as adding it at the beginning, in the middle of your cook time or just brushed on at the end. We like it all.

No matter what cooking method you use, you’ve gotta’ pour this on top or serve it on the side in a gravy boat. We now can share how to smoke corned beef because we made it recently and are ready to share.

What is Corned Beef Mustard Sauce made of?

You want 4 ingredients that will make it bold but the sweetness will counteract that tang so you have a nice balance between the two. You want brown sugar, honey (or maple syrup / agave), yellow mustard and dijon mustard.

If I am planning on using this I do not use the spice packet that comes in the bag. One or the other is best, not both. AND this meat is not just for March 17 St Patrick’s Day, it is way too good to just have it once a year I tell you!

Honey Mustard Sauce for Corned Beef

If you have extras, which is best so everyone can adjust to their liking, use a gravy boat. I mean a bowl with spoon works too but pouring is a bit easier and you can add plastic wrap to the top if you do have leftovers.

What is the best mustard to serve on top of corned beef?

It isn’t bottled y’all, you have to whisk a few things together yourself. Believe me, it only takes 5 minutes to do and is way better than just Dijon out of the jar and you stop there. You need a bit of sweetness

How to Make Mustard for Corned Beef

Add all items into a large measuring cup. I like to use a fork or whisk to mix ingredients together until it is as smooth as possible so there aren’t any chunks remaining. Depending on your method of cooking, you can pour on top an hour or so before your meat is done or serve on the side. You could do both too if you made a double batch.

Can you use this mustard on pastrami?

For sure!! It is amazing, and you can use this same blend on sandwiches for a delicious lunch year round friends. The only difference between the two is that pastrami is made from a fattier section of the brisket but the flavor of the meat is very similar.

As I said we have made this meat many different ways. Another favorite is our dutch oven corned beef and cabbage recipe, or corned beef in a Crockpot works well for sandwiches.

Try it on our Instant Pot brisket too and see if you like it on other cuts.

Nutritional information is included in the printable recipe below for you. If you want to double it you’d just need to add 1/2 cup of brown sugar and twice the amount of all the other ingredients too. Looking for other yummy sauces to serve beyond St. Patrick’s Day? Try some homemade fry sauce or bang bang shrimp sauce recipes!