The hit of beer in this tangy mustard makes it the perfect dipping sauce for the sausages.
Test-kitchen tip:
Running short on time? Make a quick version of this recipe by whisking 1 cup whole grain Dijon mustard, 1/2 cup regular Dijon mustard, 1/4 cup prepared white horseradish, and 1/4 cup lager beer in a small bowl to blend. The mustard can be made a week ahead. Store it in an airtight container in the fridge.