Cut the bread into cubes and place on a baking tray. Bake in a 180oc oven until crisp - about 10 minutes. Rub the red pepper with a little oil and roast in oven for 15 minutes. Peel, de-seed and chop.
To make the dressing, put the vinegar and olive oil into a clean jam jar or kilner ... Top with the grated carrot and tomatoes. Flake the tuna on top of the vegetables and season with pepper.