• 8 Ingredients
  • 1 tablespoon extra virgin olive oil
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  • 1 large onion, sliced
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  • ΒΌ cup mayonnaise
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  • 1 tablespoon whole grain mustard
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  • 4 thick slices sourdough bread
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  • Show all (8)
  • Nutrition 100% match
  • Calories per gram: 2.6
  • Total fat: High
  • Show all