For the Mediterranean Tuna Salad:

• 1 can tuna (preferably in olive oil), drained
• 1 tablespoon red onion, diced or thinly sliced
• 2 tablespoons green olives, diced
• 2 tablespoons fresh basil, diced
• 1 tablespoon flat leaf parsley, diced
• 1 1/2 teaspoons red wine vinegar
• 1 teaspoon Dijon mustard
• 1 small garlic clove, grated (or pinch of garlic powder)
• Kosher salt and black pepper, to taste

For the Sandwich:

• 2 slices bread (sourdough, white, or whole wheat)
• 1-2 teaspoons mayonnaise (1 teaspoon covers standard sandwich bread; use 2 for large bakery slices)
• 2 slices cheese (cheddar, gruyere, or American)
• 2 slices tomato