Preparation

• 1 - In a small bowl, combine the olive oil, lemon juice, salt and pepper. Whisk vigorously to blend and emulsify. Add Dijon mustard, chopped parsley, chopped dill and red onion. Toss to combine. Cover the bowl with plastic film and refrigerate for at 30 minutes.
  
  2 - Place the potatoes (peeled or unpeeled) in a large pot and cover by an inch of water. Add 1 tbsp of salt and bring to a boil over medium-high heat. Once the water is boiling, reduce the heat to medium and simmer for about 15 minutes until you can easily poke a knife into the potatoes. Drain immediately into a colander/strainer and allow to cool. The potatoes should be warm to the touch.
  
  3 - Slice the potatoes into 1 inch thick slices and arrange in 4 individual plates. Place 4-5 pieces of herring on top (per person) and drizzle generously with the vinaigrette. Serve immediately.