This is my new favorite way to eat a hotdog or bratwurst. It's so yummy.
1 tablespoon grainy mustard
2 teaspoons white-wine vinegar
Coarse salt and ground pepper
1/4 sweet onion (such as Vidalia), thinly sliced
1 Kirby cucumber, cut into thin strips
1 tomato, halved, seeded, and thinly sliced
1/2 cup celery leaves
2 tablespoons chopped sport pepper or peperoncini
4 pickle spears
In a medium bowl, whisk together grainy mustard and white-wine vinegar; season with coarse salt and ground pepper. Add sweet onion, cucumber, tomato, celery leaves, and sport pepper; toss to combine.
Serve on hotdog or brats with a pickle spear.