Mediterranean Tuna Salad with Creamy White Cheese

In a large bowl, mix together the Dijon mustard, olive oil, freshly squeezed lemon juice, and tuna along with its own juice. Season with salt and pepper to taste.

Peel the red onion and cut it into thin rings. Core the bell pepper, then dice it along with the cucumber and tomato. Add all the chopped vegetables to the tuna base and mix thoroughly.

Divide the prepared salad among four plates, crumble the creamy white cheese on top, and serve.