Steam green beans for about 5 minutes until crisp-tender.
Combine beans, dill, and onions in a bowl.
Whisk oil, vinegar, and mustard together for dressing.
Pour dressing over bean mixture and toss.
Chef’s Notes
To ensure this recipe is truly gluten-free, use ingredients labeled "certified gluten-free." Some foods, like oats or soy sauce, can contain traces of gluten depending on the brand or processing methods.