1. Cook the red peppers 'à l'espagnole': after washing them, grill the peppers as they are on a baking sheet without any fat, under the broiler in the oven, turning them from time to time until they are very grilled and cooked.
2. Once cooled, peel them, the skin comes off very easily, remove the stem and make sure to remove all the seeds. Cut them into coarse strips, place them in a large salad bowl, add olive oil and crushed garlic.
3. Cook the potatoes with their skin (duration depends on the size of the potatoes), once warm, peel them, cut them into cubes and place them on top of the peppers.
4. In a small container, fork-mix the tuna, chopped parsley, lemon juice, and vinegar.
5. Put both containers in the refrigerator for at least an hour before serving, unless you like warm salads, which is also delicious!
6. Just before serving, pour the tuna mixture into the large salad bowl with the rest, season with salt and pepper to taste, and enjoy!