Bring a large saucepan of water to a boil over high heat, reduce heat to medium, add the lentils and simmer until tender (20-25 minutes). Strain and transfer to a bowl. Add the sliced charred peppers and the olives. Season with salt and pepper and toss gently.
To make the dressing, add the ingredients to a small bowl and whisk to combine.
To serve, scoop the lentil mix into a bowl, top with some tuna, scatter with parmesan, drizzle with dressing and season with salt and pepper.
