Boil 350g of ready cut potatoes with some salt and sufficient water until fork tender. In the meantime, prep tuna. Drain the oil. Spoon half of the tuna flakes (from 180g can) into a bowl. Add a tsp of dijonnaise, 2 tbsp of mayonnaise, 1 tsp of sugar and salt and pepper to taste. Mix thoroughly until everything is well combined.

Remove boiled potatoes from the heat. Drain the water completely. Add the dressing (tuna mixture). Toss well so all the potatoes are well coated. Taste and adjust seasonings accordingly. Serve warm or cold.