For the tuna potato salad, boil or steam the potatoes in their skins until soft, peel while still warm and cut into slices. Mix the pieces of bell bell pepper and green onion together with the thawed peas into the potato slices. Cut the peeled eggs into eighths and carefully mix them in.
Marinate everything with a sauce of wine vinegar, oil, salt, enough pepper and pressed garlic cloves.
Finally, break up the drained tuna with a fork and mix it in.
Let the tuna-potato salad marinate for a while and serve cold.