INGREDIENTS
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10 oz albacore tuna steaks, thawed if frozen
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2 Tbsp olive oil
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¼ cup red onions, finely chopped
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2 Tbsp capers, drained
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2 Tbsp fresh basil, chopped
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1 Tbsp balsamic vinegar
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1 Tbsp Dijon mustard
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¾ cup mayonnaise
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salt and pepper to taste
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4 brioche rolls
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4 slices Swiss cheese