Ingredients
- ½ cup thinly sliced red onion
- 5 tablespoons red-wine vinegar, divided
- 2 tablespoons boiling water
- 1 12-inch crusty whole-wheat country loaf (about 1 pound)
- 2 tablespoons extra-virgin olive oil
- 1 tablespoon Dijon mustard
- ½ teaspoon ground pepper
- ¼ teaspoon salt
- 2 (5 ounce) cans oil-packed chunk light tuna, drained
- 1 cup packed baby arugula
- 1 cup thinly sliced English cucumber
- 1 cup thinly sliced radishes
- 1 cup cherry tomatoes, quartered
- ½ cup pitted olives, roughly chopped
- 4 large hard-boiled eggs, thinly sliced
- ¼ cup packed fresh basil
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