Swiss Chard Beer Garden Salad

Ingredients
Method
Heat 1 Tbsp. oil in a large skillet over medium-high. Add kielbasa in a single layer and cook until lightly browned on both sides, about 2 minutes per side; set aside.
Whisk vinegar, mustard, sugar, and ½ tsp. Diamond Crystal or ¼ tsp. Morton kosher salt in a large bowl until sugar and salt are dissolved. Add several cranks of pepper, then mix in red onion and set dressing aside.
Roll up a few Swiss chard leaves and thinly slice crosswise ¼" thick (stems, ribs, and all). Repeat with remaining leaves.
Add pretzels to bowl with dressing and stir once to coat. Add Swiss chard and remaining 3 Tbsp. oil, season with salt and pepper, and toss to combine. Add cheddar and reserved sausage and toss once more to incorporate. Taste and add more oil, vinegar, and/or salt if needed.