Ingredients
- ½ medium onion, thinly sliced
- 1 cup seasoned rice vinegar
- 2 (5-oz.) cans tuna packed in olive oil, drained
- ¼ cup mayonnaise, plus more for spreading
- 2 Tbsp. chopped celery
- 1 Tbsp. chopped dill pickles
- Kosher salt, freshly ground pepper
- 8 slices sourdough bread
- 8 slices sharp cheddar
- Dill pickle spears (for serving; optional)
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