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1. Add mayonnaise, 1-tablespoon of oil reserved from the tuna, fresh lemon juice, Dijon mustard, diced celery, roasted garlic, chop flat-leaf parsley, capers and celery seeds to medium bowl.
2. Stir in tuna.
3. Season with salt and pepper.
4. Spoon tuna onto sandwich bread. Top with Gruyère cheese and second sandwich bread slice.
5. Toast sandwiches in panini press until cheese is melted and bread is golden.
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