INGREDIENTS
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5 tablespoons red wine vinegar, divided
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1 teaspoon sugar
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1/2 cup thinly sliced shallots
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12 ounces ground sirloin
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1/4 teaspoon salt
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1/4 teaspoon freshly ground black pepper
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Cooking spray
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1 tablespoon extra-virgin olive oil
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1 teaspoon Dijon mustard
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1 teaspoon lower-sodium soy sauce
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1 1/2 cups arugula
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1 tablespoon chopped fresh chives
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2 tablespoons canola mayonnaise
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1 ounce blue cheese, crumbled (about 1/4 cup)
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8 sourdough slider buns