Mackerel with watercress

Preparation

• 1 Boil the potatoes in their skins until done.
• 2 Roughly peel the potatoes with the olive oil and season with salt and pepper.
• 3 Put the vinegar, a dash of olive oil, mustard and salt in a bowl and beat with a fork to a dressing.
• 4 Make the watercress with the dressing.
• 5 Divide the potato spread over 4 plates.
• 6 Divide the watercress over the potatoes.
• 7 Divide the mackerel over the dish.
• 8 Garnish the dish with the leek germs.